A nearby M star with three transiting super-earths discovered by K2

Crossfield, Ian J. M. and Petigura, Erik and Schlieder, Joshua E. and Howard, Andrew W. and Fulton, B. J. and Aller, Kimberly M. and Ciardi, David R. and Lepine, Sebastien and Barclay, Thomas and de Pater, Imke and de Kleer, Katherine and Quintana, Elisa V. and Schlafly, Eddie and Christiansen, Jessie L. and Kaltenegger, Lisa and Crepp, Justin R. and Henning, Thomas and Obermeier, Christian and Deacon, Niall and Weiss, Lauren M. and Isaacson, Howard T. and Hansen, Brad M. S. and Liu, Michael C. and Greene, Tom and Howell, Steve B. and Barman, Travis and Mordasini, Christoph (2015) A nearby M star with three transiting super-earths discovered by K2. The Astrophysical Journal, 804 (1). pp. 10-17. ISSN 0004-637X

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Small, cool planets represent the typical end-products of planetary formation. Studying the architectures of these systems, measuring planet masses and radii, and observing these planets' atmospheres during transit directly informs theories of planet assembly, migration, and evolution. Here we report the discovery of three small planets orbiting a bright (Ks = 8.6 mag) M0 dwarf using data collected as part of K2, the new ecliptic survey using the re-purposed Kepler spacecraft. Stellar spectroscopy and K2 photometry indicate that the system hosts three transiting planets with radii 1.5-2.1 , straddling the transition region between rocky and increasingly volatile-dominated compositions. With orbital periods of 10-45 days the planets receive just 1.5-10x the flux incident on Earth, making these some of the coolest small planets known orbiting a nearby star; planet d is located near the inner edge of the system's habitable zone. The bright, low-mass star makes this system an excellent laboratory to determine the planets' masses via Doppler spectroscopy and to constrain their atmospheric compositions via transit spectroscopy. This discovery demonstrates the ability of K2 and future space-based transit searches to find many fascinating objects of interest.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: File reproduced in accordance with the copyright policy of the publisher/author.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 02 Jun 2017 05:51
Last Modified: 27 Jun 2017 00:27
Uncontrolled Keywords: eclipses; stars: individual (EPIC 201367065); tar.gz file; techniques: photometric; techniques: spectroscopic Supporting material: data behind figure;
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: https://doi.org/10.1088/0004-637X/804/1/10
URI: http://eprints.usq.edu.au/id/eprint/32108

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