David Kipping
Columbia University (New York, Etats-Unis d'Amérique)
Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris
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| « Seeking Exomoons with HST and JWST » |
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David Kipping |
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The largest moons in the Solar System are between 25-40% the size of the Earth, leading to transit signals up to 16 times smaller than an Earth analog. Further, dynamical considerations indicate that the most probable hosts for such moons will be far from their star, leading to both a paucity of suitable planets and transit durations in excess of 12 hours. For this reason, transit searches for exomoons are most favorable with space-based photometric instruments - providing both the continuous temporal coverage and precision needed. I will discuss the controversial case of the exomoon candidate around Kepler-1625b, which was observed with Hubble WFC3. I will highlight the various arguments both for and against an exomoon around this planet and the possible path forward. Next, I will discuss new observations of Kepler-167e - a transiting Jupiter-analog - taken by JWST. These observations were used to seek both planetary oblateness and evidence of exomoons. Our 60 hour data set presents some surprises that will greatly inform future efforts.
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vendredi 12 décembre 2025 - 11:00 Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |