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25 April 2024

» arxiv » 1710.0076

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The discovery and mass measurement of a new ultra-short-period planet: EPIC~228732031b
Fei Dai ; Joshua N. Winn ; Davide Gandolfi ; Sharon X. Wang ; Johanna K. Teske ; Jennifer Burt ; Simon Albrecht ; Oscar BarragÁn ; William D. Cochran ; Michael Endl ; Malcolm Fridlund ; Artie P. Hatzes ; Teruyuki Hirano ; Lea A. Hirsch ; Marshall C. Johnson ; Anders Bo Justesen ; John Livingston ; Carina M. Persson ; Jorge Prieto-arranz ; Andrew Vanderburg ; Roi Alonso ; Giuliano Antoniciello ; Pamela Arriagada ; R.p. Butler ; Juan Cabrera ; Jeffrey D. Crane ; Felice Cusano ; SzilÁrd Csizmadia ; Hans Deeg ; Sergio B. Dieterich ; Philipp EigmÜller ; Anders Erikson ; Mark E. Everett ; Akihiko Fukui ; Sascha Grziwa ; Eike W. Guenther ; Gregory W. Henry ; Steve B. Howell ; John Asher Johnson ; Judith Korth ; Masayuki Kuzuhara ; Norio Narita ; David Nespral ; Grzegorz Nowak ; Enric Palle ; Martin PÄtzold ; Heike Rauer ; Pilar MontaÑÉs RodrÍguez ; Stephen A. Shectman ; Alexis M.s. Smith ; Ian B. Thompson ; Vincent Van Eylen ; Michael W. Williamson ; Robert A. Wittenmyer ;
Date:	29 Sep 2017
Abstract:	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 {it K2} Campaign 10. It has a radius of 1.81$^{+0.16}_{-0.12}~R_{oplus}$ and orbits a G dwarf with a period of 8.9 hours. 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 $6.5 pm 1.6~M_{oplus}$, and a mean density of $6.0^{+3.0}_{-2.7}$~g~cm$^{-3}$.
Source:	arXiv, 1710.0076
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