NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
A Sub-Neptune and a Non-Transiting Neptune-Mass Companion Unveiled by ESPRESSO Around the Bright Late-F Dwarf HD 5278 (TOI-130)Context. Transiting sub-Neptune-type planets, with radii approximately between 2 and 4R⊕, are of particular interest as their study allows us to gain insight into the formation and evolution of a class of planets that are not found in our Solar System. Aims. We exploit the extreme radial velocity (RV) precision of the ultra-stable echelle spectrograph ESPRESSO on the VLT to unveil the physical properties of the transiting sub-Neptune TOI-130 b, uncovered by the TESS mission orbiting the nearby, bright, late F-typestar HD 5278 (TOI-130) with a period of Pb=14.3 days. Methods. We used 43 ESPRESSO high-resolution spectra and broad-band photometry information to derive accurate stellar atmospheric and physical parameters of HD 5278. We exploited the TESS light curve and spectroscopic diagnostics to gauge the impact of stellar activity on the ESPRESSO RVs. We performed separate as well as joint analyses of the TESS photometry and the ESPRESSORVs using fully Bayesian frameworks to determine the system parameters. Results. Based on the ESPRESSO spectra, the updated stellar parameters of HD 5278 are Teff=6203±64K, logg=4.50±0.11dex, [Fe/H] =−0.12±0.04dex,M?=1.126+0.036−0.035M, and R?=1.194+0.017−0.016R. We determine HD 5278 b’s mass and radius to be Mb=7.8+1.5−1.4M⊕ and Rb=2.45±0.05R⊕. The derived mean density, %b=2.9+0.6−0.5g cm−3, is consistent with the bulk composition of a sub-Neptune with a substantial (∼30%) water mass fraction and with a gas envelope comprising ∼17% of the measured radius. Given the host brightness and irradiation levels, HD 5278 b is one of the best targets orbiting G-F primaries for follow-up atmospheric characterization measurements with HST and JWST. We discover a second, non-transiting companion in the system, with a period of Pc=40.87+0.18−0.17days and a minimum mass of Mcsinic=18.4+1.8−1.9M⊕. We study emerging trends in parameters space (e.g., mass, radius, stellar insolation, and mean density) of the growing population of transiting sub-Neptunes, and provide statistical evidence for a low occurrence of close-in,10−15M⊕companions around G-F primaries withTeff&5500K.
Document ID
20210026359
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
A Sozzetti ORCID
(Osservatorio Astrofisico di Torino Pino Torinese, Italy)
M Damasso ORCID
(Osservatorio Astrofisico di Torino Pino Torinese, Italy)
A. S. Bonomo
(Osservatorio Astrofisico di Torino Pino Torinese, Italy)
Y. Alibert
(University of Bern Bern, Switzerland)
S G Sousa
(University of Porto Porto, Portugal)
V. Adibekyan
(University of Porto Porto, Portugal)
M R Zapatero Osorio ORCID
(Centro de Astrobiología Torrejón de Ardoz, Spain)
J. I. González Hernández
(Instituto de Astrofisica de Canarias La Laguna, Tenerife, Spain)
S. C. C. Barros
(University of Porto Porto, Portugal)
J Lillo-Box ORCID
(Centro de Astrobiología Torrejón de Ardoz, Spain)
K. G. Stassun9,
(Vanderbilt University Nashville, Tennessee, United States)
J. Winn
(Princeton University Princeton, New Jersey, United States)
S. Cristiani
(Osservatorio Astronomico di Trieste)
F. Pepe
(University of Geneva Geneva, Switzerland)
R. Rebolo
(Instituto de Astrofisica de Canarias La Laguna, Tenerife, Spain)
N. C. Santos
(University of Porto Porto, Portugal)
R Allart ORCID
(University of Geneva Geneva, Switzerland)
T S Barclay
(University of Maryland, Baltimore County Baltimore, Maryland, United States)
F. Bouchy
(University of Geneva Geneva, Switzerland)
A. Cabral
(Lusíada University of Lisbon Lisbon, Portugal)
D. Ciardi
(California Institute of Technology Pasadena, California, United States)
P. Di Marcantonio
(Osservatorio Astronomico di Trieste)
V. D’Odorico
(Osservatorio Astronomico di Trieste)
D. Ehrenreich
(University of Geneva Geneva, Switzerland)
M. Fasnaugh
(Massachusetts Institute of Technology Cambridge, Massachusetts, United States)
P. Figueira
(University of Porto Porto, Portugal)
J Haldemann ORCID
(University of Bern Bern, Switzerland)
J. M. Jenkins
(Ames Research Center Mountain View, California, United States)
D W. Latham ORCID
(Harvard-Smithsonian Center for Astrophysics Cambridge, Massachusetts, United States)
B. Lavie
(University of Geneva Geneva, Switzerland)
G. Lo Curto
(European Southern Observatory Garching bei München, Germany)
C. Lovis
(University of Geneva Geneva, Switzerland)
J C P Martinez
(University of Porto Porto, Portugal)
D. Mégevand
(University of Geneva Geneva, Switzerland)
A Mehner
(European Southern Observatory Santiago, Chile)
G Micela ORCID
(Osservatorio Astronomico di Palermo Palermo, Italy)
P Molaro
(Instituto de Astrofisica de Canarias La Laguna, Tenerife, Spain)
N. J. Nunes
(Lusíada University of Lisbon Lisbon, Portugal)
M Oshagh ORCID
(Instituto de Astrofísica de Canarias Santa Cruz de Tenerife, Spain)
J. Otegi
(University of Zurich Zurich, Switzerland)
E Pallé ORCID
(Instituto de Astrofísica de Canarias Santa Cruz de Tenerife, Spain)
E Poretti ORCID
(Brera Astronomical Observatory Milan, Italy)
G R Ricker
(Massachusetts Institute of Technology Cambridge, Massachusetts, United States)
D. Rodriguez
(Space Telescope Science Institute Baltimore, Maryland, United States)
S. Seager
(Massachusetts Institute of Technology Cambridge, Massachusetts, United States)
A. Suárez Mascareño
(Instituto de Astrofisica de Canarias La Laguna, Tenerife, Spain)
J D Twicken
(Search for Extraterrestrial Intelligence Mountain View, California, United States)
S Udry ORCID
(University of Geneva Geneva, Switzerland)
Date Acquired
January 5, 2022
Publication Date
April 14, 2021
Publication Information
Publication: Astronomy & Astrophysics
Publisher: EDP Sciences
Volume: 648
Issue: A75
Issue Publication Date: April 1, 2021
ISSN: 0004-6361
e-ISSN: 1432-0746
Subject Category
Astronomy
Funding Number(s)
WBS: 907524
CONTRACT_GRANT: 80GSFC21M0002
CONTRACT_GRANT: 80MSFC20F0204
CONTRACT_GRANT: NNG14FC03C
CONTRACT_GRANT: 80NSSC21M0079
CONTRACT_GRANT: ASI-INAF 2018-16-HH.0
PROJECT: FP7-SPACE ETAEARTH GA 313014
Distribution Limits
Public
Copyright
Public Use Permitted.
Technical Review
External Peer Committee
Keywords
planetary systems
Planets and satellites
HD 5278 (TOI-130)
Radial velocities
Photometric
No Preview Available