Bibcode
Dai, F.; Winn, Joshua N.; Gandolfi, Davide; Wang, Sharon X.; Teske, Johanna K.; Burt, Jennifer; Albrecht, Simon; Barragán, Oscar; Cochran, William D.; Endl, Michael; Fridlund, Malcolm; Hatzes, Artie P.; Hirano, Teruyuki; Hirsch, Lea A.; Johnson, Marshall C.; Justesen, Anders Bo; Livingston, John; Persson, Carina M.; Prieto-Arranz, J.; Vanderburg, Andrew; Alonso, R.; Antoniciello, Giuliano; Arriagada, Pamela; Butler, R. P.; Cabrera, Juan; Crane, Jeffrey D.; Cusano, Felice; Csizmadia, Szilárd; Deeg, H. J.; Dieterich, Sergio B.; Eigmüller, Philipp; Erikson, Anders; Everett, Mark E.; Fukui, Akihiko; Grziwa, Sascha; Guenther, Eike W.; Henry, Gregory W.; Howell, Steve B.; Johnson, John Asher; Korth, Judith; Kuzuhara, Masayuki; Narita, Norio; Nespral, D.; Nowak, G.; Palle, E.; Pätzold, Martin; Rauer, Heike; Montañés Rodríguez, P.; Shectman, Stephen A.; Smith, Alexis M. S.; Thompson, Ian B.; Van Eylen, Vincent; Williamson, Michael W.; Wittenmyer, Robert A.
Bibliographical reference
The Astronomical Journal, Volume 154, Issue 6, article id. 226, 17 pp. (2017).
Advertised on:
12
2017
Citations
61
Refereed citations
56
Description
We report the discovery of a new ultra-short-period planet and summarize
the properties of all such planets for which the mass and radius have
been measured. The new planet, EPIC 228732031b, was discovered in K2
Campaign 10. It has a radius of {1.81}-0.12+0.16
{R}\oplus and orbits a G dwarf with a period of 8.9 hr.
Radial velocities obtained with Magellan/PFS and TNG/HARPS-N show
evidence for stellar activity along with orbital motion. We determined
the planetary mass using two different methods: (1) the “floating
chunk offset” method, based only on changes in velocity observed
on the same night; and (2) a Gaussian process regression based on both
the radial velocity and photometric time series. The results are
consistent and lead to a mass measurement of 6.5+/- 1.6 {M}\oplus
and a mean density of {6.0}-2.7+3.0 g
cm‑3.
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