TY  - JOUR
AU  - Dálya, Gergely
AU  - Takátsy, János
AU  - Bozóki, Tamás
AU  - Kapás, Kornél
AU  - Mészáros, László
AU  - Pal, A.
TI  - Towards the attitude determination of nano-satellites with thermal imaging sensors
JF  - PROCEEDINGS OF SPIE - THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING
J2  - PROCEEDINGS OF SPIE
VL  - 11451
PY  - 2020
PG  - 9
SN  - 0277-786X
DO  - 10.1117/12.2562114
UR  - https://m2.mtmt.hu/api/publication/31843869
ID  - 31843869
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Zsidi, Gabriella
AU  - Ábrahám, Péter
AU  - Acosta-Pulido, J. A.
AU  - Kóspál, Ágnes
AU  - Kun, Mária
AU  - Szabó, Zs. M.
AU  - Bódi, Attila
AU  - Cseh, Borbála
AU  - Segura, N. Castro
AU  - Hanyecz, O.
AU  - Ignácz, B.
AU  - Kalup, Csilla
AU  - Kriskovics, Levente
AU  - Mészáros, L.
AU  - Ordasi, A.
AU  - Pál, András
AU  - Sárneczky, Krisztián
AU  - Seli, B.
AU  - Sódor, Ádám
AU  - Szakáts, Róbert
TI  - The Weakening Outburst of the Young Eruptive Star V582 Aur
JF  - ASTROPHYSICAL JOURNAL
J2  - ASTROPHYS J
VL  - 873
PY  - 2019
IS  - 2
SN  - 1538-4357
DO  - 10.3847/1538-4357/ab05c9
UR  - https://m2.mtmt.hu/api/publication/30605429
ID  - 30605429
N1  - Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Konkoly-Thege Miklós út 15-17, Budapest, Hungary            
            Eötvös Loránd University, Department of Astronomy, Budapest, Hungary            
            Instituto de Astrofísica de Canarias, Avenida Vía Láctea, Tenerife, Spain            
            Departamento de Astrofísica, Universidad de la Laguna, Tenerife, Spain            
            Max Planck Institute for Astronomy, Heidelberg, Germany            
            MTA CSFK Lendület Near-Field Cosmology Research Group, Budapest, Hungary            
            Physics and Astronomy Department, University of Southampton, Southampton, United Kingdom            
            Cited By :3            
            Export Date: 13 April 2023
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Vilenius, E.
AU  - Stansberry, J.
AU  - Müller, T.
AU  - Mueller, M.
AU  - Kiss, Csaba
AU  - Santos-Sanz, P.
AU  - Mommert, M.
AU  - Pál, András
AU  - Lellouch, E.
AU  - Ortiz, J. L.
AU  - Peixinho, N.
AU  - Thirouin, A.
AU  - Lykawka, P. S.
AU  - Horner, J.
AU  - Duffard, R.
AU  - Fornasier, S.
AU  - Delsanti, A.
TI  - "TNOs are Cool": A survey of the trans-Neptunian region. XIV. Size/albedo characterization of the Haumea family observed with Herschel and Spitzer
JF  - ASTRONOMY & ASTROPHYSICS
J2  - ASTRON ASTROPHYS
VL  - 618
PB  - EDP Sciences
PY  - 2018
PG  - 15
SN  - 0004-6361
DO  - 10.1051/0004-6361/201732564
UR  - https://m2.mtmt.hu/api/publication/30307617
ID  - 30307617
N1  - Funding Agency and Grant Number: German DLR project [50 OR 1108]; European Union's Horizon 2020 Research and Innovation Programme [687378]; Hungarian Academy of Sciences [LP2012-31]; Portuguese FCT - Foundation for Science and Technology [SFRH/BGCT/113686/2015]; Portuguese National Funds through FCT - Foundation for Science and Technology [UID/Multi/00611/2013]; FEDER - European Regional Development Fund through COMPETE 2020 - Operational Programme Competitiveness and Internationalisation [POCI-01-0145-FEDER-006922]; National Research, Development and Innovation Office (NKFIH, Hungary) [K-125015, GINOP-2.3.2-15-2016-00003]
            Funding text: Part of this work was supported by the German DLR project number 50 OR 1108. T.M., C.K., P.S., and R.D. acknowledge that the research leading to these results has received funding from the European Union's Horizon 2020 Research and Innovation Programme, under Grant Agreement no 687378. A.P. acknowledges the grant LP2012-31 of the Hungarian Academy of Sciences. N.P. acknowledges funding by the Portuguese FCT - Foundation for Science and Technology (ref: SFRH/BGCT/113686/2015). CITEUC is funded by Portuguese National Funds through FCT - Foundation for Science and Technology (project: UID/Multi/00611/2013) and FEDER - European Regional Development Fund through COMPETE 2020 - Operational Programme Competitiveness and Internationalisation (project: POCI-01-0145-FEDER-006922). C.K. has been supported by the K-125015 and GINOP-2.3.2-15-2016-00003 grants of the National Research, Development and Innovation Office (NKFIH, Hungary).
AB  - Context. A group of trans-Neptunian objects (TNOs) are dynamically related to the dwarf planet 136108 Haumea. Ten of them show strong indications of water ice on their surfaces, are assumed to have resulted from a collision, and are accepted as the only known TNO collisional family. Nineteen other dynamically similar objects lack water ice absorptions and are hypothesized to be dynamical interlopers. Aims: We have made observations to determine sizes and geometric albedos of six of the accepted Haumea family members and one dynamical interloper. Ten other dynamical interlopers have been measured by previous works. We compare the individual and statistical properties of the family members and interlopers, examining the size and albedo distributions of both groups. We also examine implications for the total mass of the family and their ejection velocities. Methods: We use far-infrared space-based telescopes to observe the target TNOs near their thermal peak and combine these data with optical magnitudes to derive sizes and albedos using radiometric techniques. Using measured and inferred sizes together with ejection velocities, we determine the power-law slope of ejection velocity as a function of effective diameter. Results: The detected Haumea family members have a diversity of geometric albedos 0.3-0.8, which are higher than geometric albedos of dynamically similar objects without water ice. The median geometric albedo for accepted family members is pV = 0.48-0.18+0.28, compared to 0.08-0.05+0.07 for the dynamical interlopers. In the size range D = 175-300 km, the slope of the cumulative size distribution is q = 3.2-0.4+0.7 for accepted family members, steeper than the q = 2.0 ± 0.6 slope for the dynamical interlopers with D < 500 km. The total mass of Haumea's moons and family members is 2.4% of Haumea's mass. The ejection velocities required to emplace them on their current orbits show a dependence on diameter, with a power-law slope of 0.21-0.50. Herschel is an ESA space observatory with science instruments provided by a European-led Principal Investigator consortia and with important participation from NASA.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Pál, András
AU  - Molnár, László
AU  - Kiss, Csaba
TI  - TESS in the Solar System
JF  - PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
J2  - PUBL ASTRON SOC PAC
VL  - 130
PB  - IOP Publishing Ltd
PY  - 2018
IS  - 993
PG  - 8
SN  - 0004-6280
DO  - 10.1088/1538-3873/aae2aa
UR  - https://m2.mtmt.hu/api/publication/30307591
ID  - 30307591
N1  - Funding Agency and Grant Number: Hungarian Academy of Sciences [LP2012-31, LP2018-07]; Hungarian National Research, Development and Innovation Office (NKFIH) [PD-116175, K-125015]; NASA [NNG14FC03C]; Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences; European Unions Horizon 2020 Research and Innovation Programme [687378]
            Funding text: This work has been supported by the "Lendulet" grants LP2012-31 and LP2018-07 of the Hungarian Academy of Sciences, and by the Hungarian National Research, Development and Innovation Office (NKFIH) grants PD-116175 and K-125015. A.P. acknowledges the MIT Kavli Center and the Kavli Foundation for their hospitality during the stays at MIT and the NASA contract number NNG14FC03C. L.M. was supported by the Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences. The research leading to these results has also received funding from the European Unions Horizon 2020 Research and Innovation Programme, under grant agreement No. 687378 "Small Bodies: Near and Far". This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC,. https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.
AB  - The Transiting Exoplanet Survey Satellite (TESS), launched successfully on 2018 April 18 will observe nearly the full sky, and will provide timeseries imaging data in ∼27-day-long campaigns. TESS is equipped with four cameras, each of which has a field of view of 24 × 24°. During the first two years of the primary mission, one of these cameras, Camera #1, is going to observe fields centered at an ecliptic latitude of 18°. While the ecliptic plane itself is not covered during the primary mission, the characteristic scale height of the main asteroid belt and Kuiper Belt implies that a significant amount of small solar system bodies will cross this camera’s field of view. Based on the comparison of the expected amount of information of TESS and Kepler/K2, we can compute the cumulative étendues of the two optical setups. This comparison results in roughly comparable optical étendues however, the net étendue is significantly larger in the case of TESS because all of the imaging data provided by the 30-minute cadence frames are downlinked rather than the pre-selected stamps of Kepler/K2. In addition, many principles of the data acquisition and optical setup are clearly different, including the level of confusing background sources; full- frame integration and cadence; the field-of-view centroid with respect to the apparent position of the Sun; as well as the differences in the duration of the campaigns. As one would expect, TESS will yield timeseries photometry, and hence rotational properties for only brighter objects, but in terms of spatial and phase space coverage, this sample will be more homogeneous and more complete. Here, we review the main analogs and differences between the Kepler/K2 mission and the TESS mission, focusing on scientific implications and possible yields related to our solar system.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Vida, Krisztián
AU  - Roettenbacher, Rachael M.
TI  - Finding flares in Kepler data using machine-learning tools
JF  - ASTRONOMY & ASTROPHYSICS
J2  - ASTRON ASTROPHYS
VL  - 616
PB  - EDP Sciences
PY  - 2018
PG  - 5
SN  - 0004-6361
DO  - 10.1051/0004-6361/201833194
UR  - https://m2.mtmt.hu/api/publication/3420166
ID  - 3420166
AB  - Context. Archives of long photometric surveys, such as the Kepler database, are a great basis for studying flares. However, identifying the flares is a complex task; it is easily done in the case of single-target observations by visual inspection, but is nearly impossible for several year-long time series for several thousand targets. Although automated methods for this task exist, several problems are difficult (or impossible) to overcome with traditional fitting and analysis approaches. <BR /> Aims: We introduce a code for identifying and analyzing flares based on machine-learning methods, which are intrinsically adept at handling such data sets. <BR /> Methods: We used the RANSAC (RANdom SAmple Consensus) algorithm to model light curves, as it yields robust fits even in the case of several outliers, such as flares. The light curves were divided into search windows, approximately on the order of the stellar rotation period. This search window was shifted over the data set, and a voting system was used to keep false positives to a minimum: only those flare candidate points were kept that were identified as a flare in several windows. <BR /> Results: The code was tested on short-cadence K2 observations of TRAPPIST-1 and on long-cadence Kepler data of KIC 1722506. The detected flare events and flare energies are consistent with earlier results from manual inspections.
LA  - English
DB  - MTMT
ER  - 

TY  - CHAP
AU  - Ohno, Masanori
AU  - Werner, Norbert
AU  - Pál, András
AU  - Ripa, Jakub
AU  - Galgóczi, Gábor
AU  - Tarcai, N
AU  - Várhegyi, Z
AU  - Fukazawa, Y
AU  - Mizuno, T
AU  - Takahashi, H
AU  - Tanaka, K
AU  - Uchida, N
AU  - Torigoe, K
AU  - Nakazawa, K
AU  - Enoto, T
AU  - Odaka, H
AU  - Ichinohe, Y
AU  - Frei, Zsolt
AU  - Kiss, L. László
ED  - Nikzad, S
ED  - Den Herder, J-WA
ED  - Nakazawa, K
TI  - CAMELOT: Design and performance verification of the detector concept and localization capability
T2  - Space Telescopes and Instrumentation 2018
VL  - 10699
PB  - SPIE
CY  - Bellingham (WA)
SN  - 9781510619524
T3  - Proceedings of SPIE, ISSN 0277-786X ; 10699.
PY  - 2018
PG  - 12
DO  - 10.1117/12.2313228
UR  - https://m2.mtmt.hu/api/publication/3408120
ID  - 3408120
AB  - A fleet of nanosatellites using precise timing synchronization provided by the Global Positioning System is a new concept for monitoring the gamma-ray sky that can achieve both all-sky coverage and good localization accuracy. We are proposing this new concept for the mission CubeSats Applied for MEasuring and LOcalising Transients (CAMELOT). The differences in photon arrival times at each satellite are to be used for source localization. Detectors with good photon statistics and the development of a localization algorithm capable of handling a large number of satellites are both essential for this mission. Large, thin CsI scintillator plates are the current candidates for the detectors because of their high light yields. It is challenging to maximize the light-collection efficiency and to understand the position dependence of such thin plates. We have found a multi-channel readout that uses the coincidence technique to be very effective in increasing the light output while keeping a similar noise level to that of a single channel readout. Based on such a detector design, we have developed a localization algorithm for this mission and have found that we can achieve a localization accuracy better than 20 arc minutes and a rate of about 10 short gamma-ray bursts per year.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Werner, Norbert
AU  - Ripa, Jakub
AU  - Pál, András
AU  - Ohno, Masanori
AU  - Tarcai, N
AU  - Torigoe, K
AU  - Tanaka, K
AU  - Uchida, N
AU  - Galgóczi, Gábor
AU  - Fukazawa, Y
AU  - Mizuno, T
AU  - Takahashi, H
AU  - Nakazawa, K
AU  - Várhegyi, Z
AU  - Enoto, T
AU  - Odaka, H
AU  - Ichinohe, Y
AU  - Frei, Zsolt
AU  - Mészáros, László
AU  - Kiss, L. László
TI  - CAMELOT: Cubesats Applied for MEasuring and LOcalising Transients mission overview
JF  - PROCEEDINGS OF SPIE - THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING
J2  - PROCEEDINGS OF SPIE
VL  - 10699
PY  - 2018
PG  - 15
SN  - 9781510619524
SN  - 0277-786X
DO  - 10.1117/12.2313764
UR  - https://m2.mtmt.hu/api/publication/3408116
ID  - 3408116
AB  - We propose a fleet of nanosatellites to perform an all-sky monitoring and timing based localisation of gamma-ray transients. The fleet of at least nine 3U cubesats shall be equipped with large and thin CsI(Tl) scintillator based soft gamma-ray detectors read out by multi-pixel photon counters. For bright short gamma-ray bursts (GRBs), by cross-correlating their light curves, the fleet shall be able to determine the time difference of the arriving GRB signal between the satellites and thus determine the source position with an accuracy of similar to 10'. This requirement demands precise time synchronization and accurate time stamping of the detected gamma-ray photons, which will be achieved by using on-board GPS receivers. Rapid follow up observations at other wavelengths require the capability for fast, nearly simultaneous downlink of data using a global inter-satellite communication network. In terms of all-sky coverage, the proposed fleet will outperform all GRB monitoring missions.
LA  - English
DB  - MTMT
ER  - 

TY  - CHAP
AU  - Mészáros, László
AU  - Pál, András
ED  - Marshall, HK
ED  - Spyromilio, J
TI  - Modular electronics design for small-size telescope and dome control
T2  - GROUND-BASED AND AIRBORNE TELESCOPES VII
PB  - SPIE
CY  - Bellingham (WA)
SN  - 9781510619548
T3  - Proceedings of SPIE, ISSN 0277-786X ; 10700.
PY  - 2018
PG  - 7
DO  - 10.1117/12.2314193
UR  - https://m2.mtmt.hu/api/publication/3405096
ID  - 3405096
N1  - Funding Agency and Grant Number: Hungarian National Research, Development and Innovation Fund [GINOP-2.3.2-15-2016-00033]; European Union; Hungarian Academy of Sciences [LP2012-31]; OTKA [K-109276, K-104607, K-113117]
            Funding text: The development of these electronics is supported by the GINOP-2.3.2-15-2016-00033 project which is funded by the Hungarian National Research, Development and Innovation Fund together with the European Union and by the Hungarian Academy of Sciences via the grant LP2012-31. Additional support is also received via the OTKA grants K-109276, K-104607 and K-113117. In our project, we involved numerous free & open source software, including gEDA (for schematics and PCB design), FreeCAD (3D designs), CURA (3D slicing, GCODE generation and printing control) and AVR-GCC (for MCU programming).
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Kóspál, Ágnes
AU  - Ábrahám, Péter
AU  - Zsidi, Gabriella
AU  - Vida, Krisztián
AU  - Szabó, Róbert
AU  - Moór, Attila
AU  - Pál, András
TI  - Spots, Flares, Accretion, and Obscuration in the Pre-main-sequence Binary DQ Tau
JF  - ASTROPHYSICAL JOURNAL
J2  - ASTROPHYS J
VL  - 862
PY  - 2018
IS  - 1
PG  - 21
SN  - 1538-4357
DO  - 10.3847/1538-4357/aacafa
UR  - https://m2.mtmt.hu/api/publication/3401139
ID  - 3401139
N1  - Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Konkoly-Thege Miklós ut 15-17, Budapest, 1121, Hungary            
            Max Planck Institute for Astronomy, Königstuhl 17, Heidelberg, D-69117, Germany            
            Cited By :2            
            Export Date: 7 April 2020
AB  - DQ Tau is a young low-mass spectroscopic binary, consisting of two almost equal-mass stars on a 15.8 day period surrounded by a circumbinary disk. Here, we analyze DQ Tau’s light curves obtained by Kepler K2, the Spitzer Space Telescope, and ground-based facilities. We observed variability phenomena, including rotational modulation by stellar spots, brief brightening events due to stellar flares, long brightening events around periastron due to increased accretion, and short dips due to brief circumstellar obscuration. The rotational modulation appears as a sinusoidal variation with a period of 3.017 days. In our model, this is caused by extended stellar spots 400 K colder than the stellar effective temperature. During our 80 day long monitoring, we detected 40 stellar flares with energies up to 1.2 × 10<sup>35</sup> erg and duration of a few hours. The flare profiles closely resemble those in older late-type stars, and their occurrence does not correlate with either the rotational or the orbital period. We observe elevated accretion rates of up to 5 × 10<sup>‑8</sup> M <sub>⊙</sub> yr<sup>‑1</sup> around each periastron. Our Spitzer data suggest that the increased accretion luminosity temporarily heats up the inner part of the circumbinary disk by about 100 K. We found an inner disk radius of 0.13 au, significantly smaller than expected from dynamical modeling of circumbinary disks. Interestingly, the inner edge of the disk corotates with the binary’s orbit. DQ Tau also shows short dips of <0.1 mag in its light curve, reminiscent of the well-known “dipper phenomenon” observed in many low-mass young stars.
LA  - English
DB  - MTMT
ER  - 

TY  - GEN
AU  - Pál, András
AU  - Mészáros, László
AU  - Tarcai, Norbert
AU  - Werner, Norbert
AU  - Ripa, Jakub
AU  - Ohno, Masanori
AU  - Torigoe, Kento
AU  - Tanaka, Koji
AU  - Uchida, Nagomi
AU  - Galgóczi, Gábor
AU  - Fukazawa, Yasushi
AU  - Mizuno, Tsunefumi
AU  - Takahashi, Hiromitsu
AU  - Nakazawa, Kazuhiro
AU  - Várhegyi, Zsolt
AU  - Enoto, Teruaki
AU  - Odaka, Hirokazu
AU  - Ichinohe, Yuto
AU  - Frei, Zsolt
AU  - Kiss, L. László
TI  - CAMELOT - Concept study and early results for onboard data processing and GPS-based timestamping
PY  - 2018
UR  - https://m2.mtmt.hu/api/publication/3399607
ID  - 3399607
AB  - Due to recent advances in nanosatellite technology, it is now feasible to integrate scintillators with an effective area of hundreds of square-centimeters on a single three-unit cubesat. We present the early test results for the digital payload electronics developed for the proposed CAMELOT (Cubesats Applied for MEasuring and LOcalising Transients) mission. CAMELOT is a fleet of nanosatellites intended to do full-sky monitoring and perform accurate timing-based localization of gamma-ray transients. Here we present the early results on the GPS timestamping capabilities of the CAMELOT payload electronics, concluding that the investigated setup is capable to timestamp the received gamma-ray photons with an accuracy and precision better than 0.02 millisecond, which corresponds to a timing based localization accuracy of $\sim 3.5^{\prime}$. Further refinements will likely allow us to improve the timing accuracy down to the sub-microsecond level.
LA  - English
DB  - MTMT
ER  -