TESS Discovery of an ultra-short-period planet around the nearby M dwarf LHS 3844

Kavli Affiliate: Edward H. Morgan

| First 5 Authors: Roland Vanderspek, Chelsea X. Huang, Andrew Vanderburg, George R. Ricker, David W. Latham

| Summary:

Data from the newly-commissioned textit{Transiting Exoplanet Survey
Satellite} (TESS) has revealed a "hot Earth" around LHS 3844, an M dwarf
located 15 pc away. The planet has a radius of $1.32pm 0.02$ $R_oplus$ and
orbits the star every 11 hours. Although the existence of an atmosphere around
such a strongly irradiated planet is questionable, the star is bright enough
($I=11.9$, $K=9.1$) for this possibility to be investigated with transit and
occultation spectroscopy. The star’s brightness and the planet’s short period
will also facilitate the measurement of the planet’s mass through Doppler
spectroscopy.

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