Reference : Physical characterization of the active asteroid (6478) Gault from a multi-apparition...
Scientific congresses and symposiums : Paper published in a journal
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/264541
Physical characterization of the active asteroid (6478) Gault from a multi-apparition campaign (2018-2020)
English
Devogele, Maxime [Arecibo Observatory]
Ferrais, Marin mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Jehin, Emmanuel mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Moskovitz, Nicholas [Lowell Observatory]
Skiff, Brian [Lowell Observatory]
Levine, Stephen [Lowell Observatory]
Gustafsson, Annika [Northern Arizona University]
Farnocchia, Davide [Jet Propulsion Laboratory]
Micheli, Marco [ESA SSA-NEO Coordination Centre]
Borisov, Galin [Armagh Observatory]
Jean, Manfroid [Université de Liège]
Moulane, Youssef [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Benkhaldoun, Zouhair [Oukaimeden Observatory]
Burdanov, Artem [Massachusetts Institute of Technology]
Pozuelos, Francisco [Université de Liège]
Gillon, Michaël [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
de Wit, Julien [Massachusetts Institute of Technology]
Green, Simon [The Open University]
Bendjoya, Philippe [Observatoire de la Côte d'Azur]
Rivet, Jean-Pierre [Observatoire de la Côte d'Azur]
Abe, Luy [Observatoire de la Côte d'Azur]
David, Vernet [Observatoire de la Côte d'Azur]
Chandler, Colin [Northern Arizona University]
Trujillo, Chadwick [Northern Arizona University)]
1-Oct-2021
Bulletin of the American Astronomical Society
53
7
id. 309.04
No
No
International
AAS Division of Planetary Science meeting #53
3-8 October 2021
[en] (6478) Gault is a main-belt asteroid that was found to display cometary activity in late 2018-early 2019 [1]. During its 2018-2019 apparition, Gault experienced several activity events leading to the development of up to three distinct tails [2,3,4]. Many hypotheses such as impacts with smaller objects, YORP induced spin-up [5], sublimation of volatiles [6], or even the presence of a satellite in a highly eccentric and chaotic orbit, were considered to explain these events. <P />In this talk we present new photometric and spectroscopic observations of Gault obtained during the 2018-2019 and 2020 apparitions. These observations were obtained both when Gault was active (during the 2018-2019 apparition) and when it was found to be inactive during the 2020 apparition. For the first time we determine an accurate rotation period with high confidence of P=2.4929 ± 0.0003 h with a low amplitude of only 0.06 mag. This rotation period associated with a low lightcurve amplitude is consistent with a bulk density no smaller than 1.85 g cm3 in order for its activity to be triggered by the YORP spin-up mechanism. Our spectral analysis is consistent with Gault being of ordinary chondrite-like composition. Several spectra and a large datasets of broad band spectro-photometric observations obtained over the two oppositions do not show any sign of spectral variation over time. <P />Finally, we did not find any statistically significant signal of non-gravitational accelerations due to its activity even after the addition of previously unidentified detections of Gault dating back to 1958, which increased its orbital arc by a factor of almost 2. <P />These results were published in [7]. <P />References: <P />[1]: Smith K. W., Denneau L., Vincent J. B., et al., 2019, CBET, 4594 <P />[2]: Jehin E., Ferrais M., Moulane Y., et al. 2019, CBET, 4606 <P />[3]: Ye Q., et al., 2019, The ApJ Letters, 874, L16 <P />[4]: Jewitt D., Kim Y., Luu J., et al. 2019, The ApJ Letters, 876, L19 <P />[5]: Kleyna J. T., et al., 2019, The ApJ Letters, 874, L20 <P />[6]: Ferrín I., Fornari C., Acosta A., 2019, MNRAS, 490, 219 <P />[7]: Devogèle M., Ferrais M, Jehin E, et al. 2021, MNRAS, 505, 245
Professionals
http://hdl.handle.net/2268/264541
https://ui.adsabs.harvard.edu/abs/2021DPS....5330904D

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