TY - JOUR
T1 - $π$ Earth
T2 - a 3.14-day Earth-sized Planet from $\textit{K2}$'s Kitchen Served Warm by the SPECULOOS Team
AU - Niraula, Prajwal
AU - Wit, Julien de
AU - Rackham, Benjamin V.
AU - Ducrot, Elsa
AU - Burdanov, Artem
AU - Crossfield, Ian J. M.
AU - Grootel, Valerie Van
AU - Murray, Catriona
AU - Garcia, Lionel J.
AU - Alonso, Roi
AU - Beard, Corey
AU - Chew, Yilen Gomez Maqueo
AU - Delrez, Laetitia
AU - Demory, Brice-Olivier
AU - Fulton, Benjamin J.
AU - Gillon, Michael
AU - Gunther, Maximilian N.
AU - Howard, Andrew W.
AU - Issacson, Howard
AU - Jehin, Emmanuel
AU - Pedersen, Peter P.
AU - Pozuelos, Francisco J.
AU - Queloz, Didier
AU - Rebolo-Lopez, Rafael
AU - Sairam, Lalitha
AU - Sebastian, Daniel
AU - Thompson, Samantha
AU - Triaud, Amaury H. M. J.
PY - 2020/7/23
Y1 - 2020/7/23
N2 - We report on the discovery of a transiting Earth-sized (0.95$R_\oplus$) planet around an M3.5 dwarf star at 57$\,$pc, K2-315b. The planet has a period of $\sim$3.14 days, i.e. ${\sim}\pi$, with an instellation of 7.45$\,$S$_{\oplus}$. The detection was made using publicly available data from $\textit{K2}$'s Campaign 15. We observed three additional transits with SPECULOOS Southern and Northern Observatories, and a stellar spectrum from Keck/HIRES, which allowed us to validate the planetary nature of the signal. The confirmed planet is well suited for comparative terrestrial exoplanetology. While exoplanets transiting ultracool dwarfs present the best opportunity for atmospheric studies of terrestrial exoplanets with the $\textit{James Webb Space Telescope}$, those orbiting mid-M dwarfs within 100$\,$pc such as K2-315b will become increasingly accessible with the next generation of observatories.
AB - We report on the discovery of a transiting Earth-sized (0.95$R_\oplus$) planet around an M3.5 dwarf star at 57$\,$pc, K2-315b. The planet has a period of $\sim$3.14 days, i.e. ${\sim}\pi$, with an instellation of 7.45$\,$S$_{\oplus}$. The detection was made using publicly available data from $\textit{K2}$'s Campaign 15. We observed three additional transits with SPECULOOS Southern and Northern Observatories, and a stellar spectrum from Keck/HIRES, which allowed us to validate the planetary nature of the signal. The confirmed planet is well suited for comparative terrestrial exoplanetology. While exoplanets transiting ultracool dwarfs present the best opportunity for atmospheric studies of terrestrial exoplanets with the $\textit{James Webb Space Telescope}$, those orbiting mid-M dwarfs within 100$\,$pc such as K2-315b will become increasingly accessible with the next generation of observatories.
KW - astro-ph.EP
U2 - 10.3847/1538-3881/aba95f
DO - 10.3847/1538-3881/aba95f
M3 - Article
SN - 0004-6256
VL - 160
JO - The Astronomical Journal
JF - The Astronomical Journal
IS - 4
ER -