J/A+A/687/A226 TOI-5076b flux and velocity curves (Montalto+, 2024)
The GAPS programme at TNG. LVII. TOI-5076b: A warm sub-Neptune planet orbiting a
thin-to-thick-disk transition star in a wide binary system.
Montalto M., Greco N., Biazzo K., Desidera S., Andreuzzi G., Bieryla A.,
Bignamini A., Bonomo A.S., Briceno C., Cabona L., Cosentino R.,
Damasso M., Fiorenzano A., Fong W., Goeke B., Hesse K.M., Kostov V.B.,
Lanza A.F., Latham D.W., Law N., Mancini L., Maggio A., Molinaro M.,
Mann A.W., Mantovan G., Naponiello L., Nardiello D., Nascimbeni V.,
Pagano I., Pedani M., Safonov B.S., Scandariato G., Seager S., Singh V.,
Sozzetti A., Strakhov I.A., Winn J.N., Ziegler C., Zingales T.
<Astron. Astrophys. 687, A226 (2024)>
=2024A&A...687A.226M 2024A&A...687A.226M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry ; Optical ;
Spectroscopy
Keywords: techniques: photometric - techniques: radial velocities -
planets and satellites: gaseous planets - binaries: visual -
planets and satellites: general - planets and satellites: oceans
Abstract:
We report the confirmation of a new transiting exoplanet orbiting the
star TOI-5076.
We present our vetting procedure and follow-up observations which led
to the confirmation of the exoplanet TOI-5076b. In particular, we
employed high-precision TESS photometry, high-angular-resolution
imaging from several telescopes, and high-precision radial velocities
from HARPS-N.
From the HARPS-N spectroscopy, we determined the spectroscopic
parameters of the host star: Teff=(5070±143)K, logg=(4.6±0.3),
[Fe/H]=(+0.20±0.08), and [alpha/Fe]=0.05±0.06. The transiting
planet is a warm sub-Neptune with a mass mp=(16±2)M⊕, a
radius rp=(3.2±0.l)R⊕ yielding a density
ρp=(2.8±0.5)g/cm3. It revolves around its star approximately
every 23.445 days.
The host star is a metal-rich, K2V dwarf, located at about 82 pc from
the Sun with a radius of R*=(0.78±0.01)R☉ and a mass of
M*=(0.80±0.07)M☉. It forms a common proper motion pair with an
M-dwarf companion star located at a projected separation of 2178au.
The chemical analysis of the host-star and the Galactic-space
velocities indicate that TOI-5076 belongs to the old population of
thin-to-thick-disk transition stars. The density of TOI-5076b suggests
the presence of a large fraction by volume of volatiles overlying a
massive core. We found that a circular orbit solution is marginally
favored with respect to an eccentric orbit solution for TOI-5076b.
Description:
TOI-5076 was observed by TESS between August, 2021 and November, 2021.
Spectroscopic observations were obtained with the HARPS-N spectrograph
at the Telescopio Nazionale Galileo (TNG) at the Observatorio del
Roque de los Muchachos (La Palma). HARPS-N is an echelle spectrograph
covering the wavelength range from 383 to 693 nm, with a spectral
resolution R = 115 000, which allows radial-velocity measurements with
the highest accuracy currently available in the northern hemisphere.
We acquired 44 measurements with an exposure time of 15 min, 20 min,
or 30 min within the context of the GAPS program. The observations
were performed between August 16, 2022 and March 16, 2023.
Table 2 contains photometric data obtained from the analysis of
TESS satellite images. Table 3 contains spectroscopic data obtained
from the analysis of HARPS-N spectra.
Objects:
----------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------
03 22 02.31 +17 14 23.8 TOI-5076 = HIP 15683
----------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 41 9592 Photometric data obtained from the analysis of
TESS satellite images
table3.dat 59 44 Spectroscopic data obtained from the analysis
of HARPS-N spectra
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 17 F17.9 d Time Barycentric Julian date (BJD) in Barycentric
Dynamical Time (TDB) at mid exposure
18- 29 F12.9 --- Flux Normalized flux
30- 41 F12.9 --- e_Flux Error on normalized flux
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 16 F16.8 d Time Barycentric Julian date (BJD) at mid exposure
17- 24 F8.4 km/s RV Radial velocity
25- 31 F7.4 km/s e_RV Error on radial velocity
32- 39 F8.4 km/s bis Bisector span
40- 46 F7.4 km/s ccf Cross-correlation function FWHM
47- 53 F7.3 [-] logRhk Activity index log R'HK
54- 59 F6.3 [-] e_logRhk Error on activity index log R'HK
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Acknowledgements:
Marco Montalto, marco.montalto(at)inaf.it
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(End) Marco Montalto [INAF-OACT], Patricia Vannier [CDS] 29-May-2024