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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/20.500.12386/28769
Title: An 11 Earth-mass, Long-period Sub-Neptune Orbiting a Sun-like Star
Authors: Mayo, Andrew W.
Rajpaul, Vinesh M.
Buchhave, Lars A.
Dressing, Courtney D.
Mortier, Annelies
Zeng, Li
Fortenbach, Charles D.
Aigrain, Suzanne
BONOMO, ALDO STEFANO 
Collier Cameron, Andrew
Charbonneau, David
Coffinet, Adrien
COSENTINO, Rosario 
Damasso, Mario 
Dumusque, Xavier
Martinez Fiorenzano, A. F.
Haywood, Raphaëlle D.
Latham, David W.
López-Morales, Mercedes
Malavolta, Luca 
MICELA, Giuseppina 
MOLINARI, Emilio Carlo 
Pearce, Logan
Pepe, Francesco
Phillips, David
Piotto, Giampaolo
PORETTI, Ennio 
Rice, Ken
SOZZETTI, Alessandro 
Udry, Stephane
Issue Date: 2019
Journal: THE ASTRONOMICAL JOURNAL 
Number: 158
Issue: 4
First Page: 165
Abstract: Although several thousands of exoplanets have now been detected and characterized, observational biases have led to a paucity of long-period, low-mass exoplanets with measured masses and a corresponding lag in our understanding of such planets. In this paper we report the mass estimation and characterization of the long-period exoplanet Kepler-538b. This planet orbits a Sun-like star (V = 11.27) with {M}<SUB>* </SUB>={0.892}<SUB>-0.035</SUB><SUP>+0.051</SUP> M <SUB>☉</SUB> and {R}<SUB>* </SUB> ={0.8717}<SUB>-0.0061</SUB><SUP>+0.0064</SUP> R <SUB>☉</SUB>. Kepler-538b is a {2.215}<SUB>-0.034</SUB><SUP>+0.040</SUP> R <SUB>⊕</SUB> sub-Neptune with a period of P = 81.73778 ± 0.00013 days. It is the only known planet in the system. We collected radial velocity (RV) observations with the High Resolution Echelle Spectrometer (HIRES) on Keck I and High Accuracy Radial velocity Planet Searcher in North hemisphere (HARPS-N) on the Telescopio Nazionale Galileo (TNG). We characterized stellar activity by a Gaussian process with a quasi-periodic kernel applied to our RV and cross-correlation function FWHM observations. By simultaneously modeling Kepler photometry, RV, and FWHM observations, we found a semi-amplitude of K={1.68}<SUB>-0.38</SUB><SUP>+0.39</SUP> m s<SUP>-1</SUP> and a planet mass of {M}<SUB>p</SUB>={10.6}<SUB>-2.4</SUB><SUP>+2.5</SUP> M <SUB>⊕</SUB>. Kepler-538b is the smallest planet beyond P = 50 days with an RV mass measurement. The planet likely consists of a significant fraction of ices (dominated by water ice), in addition to rocks/metals, and a small amount of gas. Sophisticated modeling techniques such as those used in this paper, combined with future spectrographs with ultra high-precision and stability will be vital for yielding more mass measurements in this poorly understood exoplanet regime. This in turn will improve our understanding of the relationship between planet composition and insolation flux and how the rocky to gaseous transition depends on planetary equilibrium temperature.
URI: http://hdl.handle.net/20.500.12386/28769
URL: https://iopscience.iop.org/article/10.3847/1538-3881/ab3e2f
ISSN: 0004-6256
DOI: 10.3847/1538-3881/ab3e2f
Bibcode ADS: 2019AJ....158..165M
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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