PT  - JOURNAL ARTICLE
AU  - Teachey, Alex
AU  - Kipping, David M.
TI  - Evidence for a large exomoon orbiting Kepler-1625b
AID  - 10.1126/sciadv.aav1784
DP  - 2018 Oct 01
TA  - Science Advances
PG  - eaav1784
VI  - 4
IP  - 10
4099  - http://advances.sciencemag.org/content/4/10/eaav1784.short
4100  - http://advances.sciencemag.org/content/4/10/eaav1784.full
SO  - Sci Adv2018 Oct 01; 4
AB  - Exomoons are the natural satellites of planets orbiting stars outside our solar system, of which there are currently no confirmed examples. We present new observations of a candidate exomoon associated with Kepler-1625b using the Hubble Space Telescope to validate or refute the moon’s presence. We find evidence in favor of the moon hypothesis, based on timing deviations and a flux decrement from the star consistent with a large transiting exomoon. Self-consistent photodynamical modeling suggests that the planet is likely several Jupiter masses, while the exomoon has a mass and radius similar to Neptune. Since our inference is dominated by a single but highly precise Hubble epoch, we advocate for future monitoring of the system to check model predictions and confirm repetition of the moon-like signal.