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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/25284
Title: Kepler-21b: A Rocky Planet Around a V = 8.25 Magnitude Star
Authors: López-Morales, Mercedes
Haywood, Raphaëlle D.
Coughlin, Jeffrey L.
Zeng, Li
Buchhave, Lars A.
Giles, Helen A. C.
AFFER, Laura 
BONOMO, ALDO STEFANO 
Charbonneau, David
Collier Cameron, Andrew
Consentino, Rosario
Dressing, Courtney D.
Dumusque, Xavier
Figueira, Pedro
Fiorenzano, Aldo F. M.
HARUTYUNYAN, AVET
Johnson, John Asher
Latham, David W.
Lopez, Eric D.
Lovis, Christophe
Malavolta, Luca 
Mayor, Michel
MICELA, Giuseppina 
MOLINARI, Emilio Carlo 
Mortier, Annelies
Motalebi, Fatemeh
NASCIMBENI, VALERIO 
Pepe, Francesco
Phillips, David F.
Piotto, Giampaolo
Pollacco, Don
Queloz, Didier
Rice, Ken
Sasselov, Dimitar
Segransan, Damien
SOZZETTI, Alessandro 
Udry, Stephane
Vanderburg, Andrew
Watson, Chris
Issue Date: 2016
Journal: THE ASTRONOMICAL JOURNAL 
Number: 152
Issue: 6
First Page: 204
Abstract: HD 179070, aka Kepler-21, is a V = 8.25 F6IV star and the brightest exoplanet host discovered by Kepler. An early detailed analysis by Howell et al. of the first 13 months (Q0-Q5) of Kepler light curves revealed transits of a planetary companion, Kepler-21b, with a radius of about 1.60 ± 0.04 R_E and an orbital period of about 2.7857 days. However, they could not determine the mass of the planet from the initial radial velocity (RV) observations with Keck-HIRES, and were only able to impose a 2σ upper limit of 10 M_E. Here, we present results from the analysis of 82 new RV observations of this system obtained with HARPS-N, together with the existing 14 HIRES data points. We detect the Doppler signal of Kepler-21b with a RV semiamplitude K = 2.00 ± 0.65 m/s, which corresponds to a planetary mass of 5.1 ± 1.7 M_E. We also measure an improved radius for the planet of 1.639 +0.019/-0.015 R_E, in agreement with the radius reported by Howell et al. We conclude that Kepler-21b, with a density of 6.4 ± 2.1 g/cm^-3, belongs to the population of small, ≲6 M_E planets with iron and magnesium silicate interiors, which have lost the majority of their envelope volatiles via stellar winds or gravitational escape. The RV analysis presented in this paper serves as an example of the type of analysis that will be necessary to confirm the masses of TESS small planet candidates. -- Based on observations made with the Italian Telescope Nazionale Galileo (TNG) operated on the island of La Palma by the Fundación Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.
URI: http://hdl.handle.net/20.500.12386/25284
URL: https://iopscience.iop.org/article/10.3847/0004-6256/152/6/204
ISSN: 0004-6256
DOI: 10.3847/0004-6256/152/6/204
Bibcode ADS: 2016AJ....152..204L
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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