The HD 93963 A transiting system: A 1.04d super-Earth and a 3.65 d sub-Neptune discovered by TESS and CHEOPS
Artikel i vetenskaplig tidskrift, 2022
We present the discovery of two small planets transiting HD 93963A (TOI-1797), a GOV star (M-* = 1.109 +/- 0.043M(circle dot), R-* = 1.043 +/- 0.009 R-circle dot) in a visual binary system. We combined TESS and CHEOPS space-borne photometry with MuSCAT 2 ground-based photometry, 'Alopeke and PHARO high-resolution imaging, TRES and FIES reconnaissance spectroscopy, and SOPHIE radial velocity measurements. We validated and spectroscopically confirmed the outer transiting planet HD 93963 A c, a sub-Neptune with an orbital period of P-c approximate to 3.65 d that was reported to be a TESS object of interest (TOI) shortly after the release of Sector 22 data. HD 93963 A c has amass of M-c = 19.2 +/- 4.1 M-circle plus and a radius of R-c = 3.228 +/- 0.059 R-circle plus, implying a mean density of rho(c) = 3.1 +/- 0.7 g cm(-3). The inner object, HD 93963 A b, is a validated 1.04 d ultra-short period (USP) transiting super-Earth that we discovered in the TESS light curve and that was not listed as a TOI, owing to the low significance of its signal (TESS signal-to-noise ratio approximate to 6.7, TESS + CHEOPS combined transit depth D-b = 141.5(-8.3)(+8.5) ppm). We intensively monitored the star with CHEOPS by performing nine transit observations to confirm the presence of the inner planet and validate the system. HD 93963 A b is the first small (R-b = 1.35 +/- 0.042 R-circle plus) USP planet discovered and validated by TESS and CHEOPS. Unlike planet c, HD 93963 Ab is not significantly detected in our radial velocities (M-b = 7.8 +/- 3.2 M-circle plus). The two planets are on either side of the radius valley, implying that they could have undergone completely different evolution processes. We also discovered a linear trend in our Doppler measurements, suggesting the possible presence of a long-period outer planet. With a V-band magnitude of 9.2, HD 93963 A is among the brightest stars known to host a USP planet, making it one of the most favourable targets for precise mass measurement via Doppler spectroscopy and an important laboratory to test formation, evolution, and migration models of planetary systems hosting ultra-short period planets.
instrumentation: spectrographs
planets and satellites: detection
planets and satellites: fundamental parameters
instrumentation: photometers
methods: data analysis
Författare
L. M. Serrano
Universita degli Studi di Torino
D. Gandolfi
Universita degli Studi di Torino
S. Hoyer
Aix-Marseille Université
A. Brandeker
Stockholms universitet
M. J. Hooton
Universität Bern
S. Sousa
Universidade do Porto
F. Murgas
Universidad de la Laguna
Instituto de Astrofísica de Canarias
D. R. Ciardi
California Institute of Technology (Caltech)
S. B. Howell
NASA Ames Research Center
W. Benz
Universität Bern
N. Billot
Université de Genève
H-G Floren
Stockholms universitet
A. Bekkelien
Université de Genève
A. Bonfanti
Österreichische Akademie der Wissenschaften
A. Krenn
Österreichische Akademie der Wissenschaften
Alexander James Mustill
Lunds universitet
T. G. Wilson
University of St Andrews
H. Osborn
Massachusetts Institute of Technology (MIT)
Universität Bern
H. Parviainen
Instituto de Astrofísica de Canarias
Universidad de la Laguna
N. Heidari
Aix-Marseille Université
Université Nice Sophia Antipolis (UNS)
Shahid Beheshti University
E. Palle
Universidad de la Laguna
Instituto de Astrofísica de Canarias
Malcolm Fridlund
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
V Adibekyan
Universidade do Porto
L. Fossati
Österreichische Akademie der Wissenschaften
M. Deleuil
Aix-Marseille Université
E. Knudstrup
Aarhus Universitet
Nordic Optical Telescope
K. A. Collins
Harvard-Smithsonian Center for Astrophysics
K. W. F. Lam
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
S. Grziwa
Universität zu Köln
S. Salmon
Université de Genève
S. H. Albrecht
Aarhus Universitet
Y. Alibert
Universität Bern
R. Alonso
Instituto de Astrofísica de Canarias
Universidad de la Laguna
G. Anglada-Escude
Institut d'Estudis Espacials de Catalunya (IEEC)
Consejo Superior de Investigaciones Científicas (CSIC)
T. Barczy
Admatis
D. Barrado y Navascues
Centro de Astrobiología (INTA-CSIC)
S. C. C. Barros
Universidade do Porto
W. Baumjohann
Österreichische Akademie der Wissenschaften
M. Beck
Université de Genève
T. Beck
Universität Bern
A. Bieryla
Harvard-Smithsonian Center for Astrophysics
X. Bonfils
Université Grenoble Alpes
P. T. Boyd
NASA Goddard Space Flight Center
C. Broeg
Universität Bern
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
S. Charnoz
Université Paris Descartes
B. Chazelas
Université de Genève
J. L. Christiansen
California Institute of Technology (Caltech)
A. Collier Cameron
University of St Andrews
P. Cortes-Zuleta
Aix-Marseille Université
Sz Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
M. B. Davies
Lunds universitet
A. Deline
Université de Genève
L. Delrez
Université de Genève
Universite de Liège
O. D. S. Demangeon
Universidade do Porto
B-O Demory
Universität Bern
A. Dunlavey
California Institute of Technology (Caltech)
University of California at Santa Cruz
D. Ehrenreich
Université de Genève
A. Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
A. Fortier
Universität Bern
A. Fukui
Instituto de Astrofísica de Canarias
University of Tokyo
Z. Garai
Eötvös Loránd University (ELTE)
Slovak Academy of Sciences
M. Gillon
Universite de Liège
M. Gudel
Universität Wien
G. Hebrard
Université Pierre et Marie Curie (UPMC)
Aix-Marseille Université
K. Heng
Universität Bern
The University of Warwick
C. X. Huang
Massachusetts Institute of Technology (MIT)
K. G. Isaak
European Space Research and Technology Centre (ESA ESTEC)
J. M. Jenkins
NASA Ames Research Center
L. L. Kiss
Magyar Tudomanyos Akademia
J. Laskar
Sorbonne Université
D. W. Latham
Harvard-Smithsonian Center for Astrophysics
A. Lecavelier des Etangs
Université Pierre et Marie Curie (UPMC)
M. Lendl
Université de Genève
A. M. Levine
Massachusetts Institute of Technology (MIT)
C. Lovis
Université de Genève
M. B. Lund
California Institute of Technology (Caltech)
D. Magrin
Istituto nazionale di astrofisica (INAF)
P. F. L. Maxted
Keele University
N. Narita
Instituto de Astrofísica de Canarias
University of Tokyo
Astrobiology Center, Japan
V Nascimbeni
Istituto nazionale di astrofisica (INAF)
G. Olofsson
Stockholms universitet
R. Ottensamer
Universität Wien
I Pagano
Istituto nazionale di astrofisica (INAF)
Pessanha
Citizen Scientist
G. Peter
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
G. Piotto
Università di Padova
Istituto nazionale di astrofisica (INAF)
D. Pollacco
The University of Warwick
D. Queloz
Eidgenössische Technische Hochschule Zürich (ETH)
University of Cambridge
R. Ragazzoni
Istituto nazionale di astrofisica (INAF)
Università di Padova
N. Rando
Europeiska rymdorganisationen (ESA)
F. Ratti
Europeiska rymdorganisationen (ESA)
H. Rauer
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Technische Universität Berlin
Freie Universität Berlin
I Ribas
Institut d'Estudis Espacials de Catalunya (IEEC)
Consejo Superior de Investigaciones Científicas (CSIC)
G. Ricker
Massachusetts Institute of Technology (MIT)
P. Rowden
Royal Astronomical Society
N. C. Santos
Universidade do Porto
G. Scandariato
Istituto nazionale di astrofisica (INAF)
S. Seager
Massachusetts Institute of Technology (MIT)
D. Segransan
Université de Genève
A. E. Simon
Universität Bern
A. M. S. Smith
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
M. Steller
Österreichische Akademie der Wissenschaften
Gy M. Szabo
Eötvös Loránd University (ELTE)
N. Thomas
Universität Bern
J. D. Twicken
NASA Ames Research Center
S. Udry
Université de Genève
B. Ulmer
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
V. Van Grootel
Universite de Liège
R. Vanderspek
Massachusetts Institute of Technology (MIT)
V. Viotto
Istituto nazionale di astrofisica (INAF)
N. Walton
University of Cambridge
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 667 A1Satellitstudier av exoplaneters mångfald
Rymdstyrelsen (174/18), 2019-02-04 -- 2023-08-01.
Ämneskategorier
Medicinsk laboratorie- och mätteknik
Astronomi, astrofysik och kosmologi
Signalbehandling
DOI
10.1051/0004-6361/202243093