π Earth: A 3.14 day Earth-sized Planet from K2's Kitchen Served Warm by the SPECULOOS Team
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Niraula_2020_AJ_160_172.pdf
Description
Published version
Size
11.7 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Niraula, Prajwal
de Wit, Julien
Rackham, Benjamin V
Ducrot, Elsa
Burdanov, Artem
Crossfield, Ian J. M.
Grootel, Valérie Van
Murray, Catriona
Garcia, Lionel J.
Alonso, Roi
Date Issued
September 2020
Journal
Astronomical Journal
Publisher
American Astronomical Society
Citation
Niraula, Prajwal et al. "π Earth: A 3.14 day Earth-sized Planet from K2's Kitchen Served Warm by the SPECULOOS Team." Astronomical Journal 160, 4 (September 2020): 172 © 2020 The American Astronomical Society
Version
Final published version
Abstract
We report on the discovery of a transiting Earth-sized (0.95R ⊕) planet around an M3.5 dwarf star at 57 pc, EPIC 249631677. The planet has a period of ~3.14 days, i.e., ~π, with an installation of 7.45 S⊕. The detection was made using publicly available data from 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 James Webb Space Telescope, those orbiting mid-M dwarfs within 100 pc such as EPIC 249631677b will become increasingly accessible with the next generation of observatories.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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Persistent DSpace Link
DOI of Published Version
https://doi.org/10.3847/1538-3881/aba95f
