J/A+A/682/A129 TOI-5398 spectroscopic time-series (Mantovan+, 2024)
The GAPS programme at TNG. XLIX. TOI-5398, the youngest compact multi-planet
system composed of an inner sub-Neptune and an outer warm Saturn.
Mantovan G., Malavolta L., Desidera S., Zingales T., Borsato L., Piotto G.,
Maggio A., Locci D., Polychroni D., Turrini D., Baratella M., Biazzo K.,
Nardiello D., Stassun K., Nascimbeni V., Benatti S., Anna John A.,
Watkins C., Bieryla A., Lissauer J.J., Twicken J.D., Lanza A.F., Winn J.N.,
Messina S., Montalto M., Sozzetti A., Boffin H., Cheryasov D., Strakhov I.,
Murgas F., D'Arpa M., Barkaoui K., Benni P., Bignamini A., Bonomo A.S.,
Borsa F., Cabona L., Cameron A.C., Claudi R., Cochran W., Collins K.A.,
Damasso M., Dong J., Endl M., Fukui A., Furesz G., Gandolfi D., Ghedina A.,
Jenkins J., Kabath P., Latham D.W., Lorenzi V., Luque R., Maldonado J.,
McLeod K., Molinaro M., Narita N., Nowak G., Orell-Miquel J., Palle E.,
Parviainen H., Pedani M., Quinn S.N., Relles H., Rowden P., Scandariato G.,
Schwarz R., Seager S., Shporer A., Vanderburg A., Wilson T.G.
<Astron. Astrophys. 682, A129 (2024)>
=2024A&A...682A.129M 2024A&A...682A.129M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities ;
Optical
Keywords: planetary systems - planets and satellites: fundamental parameters -
stars: fundamental parameters - stars: individual: BD+37 2118 -
techniques: photometric - techniques: radial velocities -
planet-star interactions
Abstract:
Short-period giant planets (P≲10-days, Mp>0.1Mj) are frequently
found to be solitary compared to other classes of exoplanets. Small
inner companions to giant planets with P≲15-days are known only in
five compact systems: WASP-47, Kepler-730, WASP-132, TOI-1130, and
TOI-2000. Here, we report the confirmation of TOI-5398, the youngest
compact multi-planet system composed of a hot sub-Neptune (TOI-5398 c,
Pc=4.77271-days) orbiting interior to a short-period Saturn
(TOI-5398 b, Pb=10.590547-days) planet, both transiting around a
650±150Myr G-type star. As part of the Global Architecture of
Planetary System (GAPS) Young Object project, we confirmed and
characterised this compact system, measuring the radius and mass of
both planets, thus constraining their bulk composition. Using
multidimensional Gaussian processes, we simultaneously modelled
stellar activity and planetary signals from Transiting Exoplanet
Survey Satellite (TESS) Sector 48light curve and our High Accuracy
Radial velocity Planet Searcher (HARPS-N) radial velocity time series.
We have confirmed the planetary nature of both planets, TOI-5398 b and
TOI-5398 c, alongside a precise estimation of stellar
parameters.Through the use of astrometric, photometric, and
spectroscopic observations, our findings indicate that TOI-5398 is a
young, active G dwarf star (650±150Myr), with a rotational
period of Prot=7.34-days. The transit photometry and radial velocity
measurements enabled us to measure both the radius and mass of planets
b, Rb=10.30±0.40REarth, Mb=58.7±5.7MEarth, and c,
Rc=3.52±0.19REarth, Mc=11.8±4.8MEarth. TESS observed
TOI-5398 during sector 48 and no further observations are planned in
the current Extended Mission, making our ground-based light curves
crucial for ephemeris improvement. With a Transmission Spectroscopy
Metric value around 300, TOI-5398 bis the most amenable warm giant
(10<P<100-days) for JWST atmospheric characterisation.
Description:
Observations of TOI-5398 with HARPS-N at TNG spanning the period
between May 2022 and June 2023. A total of 86 spectra, with exposure
times ranging from 900 to 1200s. These spectra cover the wavelength
range 383-693nm with a resolving power of R∼115000.
Objects:
----------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------
10 47 31.09 +36 19 45.8 TOI-5398 = BD+37 2118
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 103 86 Spectroscopic time-series
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 12 F12.6 d BJD Time TDB (BJD-2400000)
14- 22 F9.3 m/s RV Radial velocity
24- 28 F5.3 m/s e_RV Radial velocity uncertainty
30- 38 F9.4 m/s BIS CCF bisector span
40- 45 F6.4 m/s e_BIS CCF bisector span uncertainty
47- 53 F7.4 --- logR'HK logR'HK index
55- 60 F6.4 --- e_logR'HK logR'HK index uncertainty
62- 67 F6.4 --- Ha Hα index
69- 74 F6.4 --- e_Ha Hα index uncertainty
76- 82 F7.4 km/s FWHM CCF FWHM
84- 89 F6.4 km/s e_FWHM CCF FWHM uncertainty
91- 96 F6.4 km/s EW CCF equivalent width
98-103 F6.4 km/s e_EW CCF equivalent width uncertainty
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Acknowledgements:
Giacomo Mantovan, giacomo.mantovan(at)phd.unipd.it
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(End) Giacomo Mantovan [Unipd, Italy], Patricia Vannier [CDS] 31-Oct-2023