J/A+A/697/A169 TOI-3493 RVs and activity indicators (Chaturvedi+, 2025)
TOI-3493 b:
A planet with a Neptune-like density transiting a bright G0 type star.
Chaturvedi P., Goffo E., Gandolfi D., Persson C.M., Hatzes A.P., Nowak G.,
Bonfanti A., Bieryla A., Cochran W.D., Collins K.A., Fajardo-Acosta S.B.,
Howell S.B., Jenkins J.M., Korth J., Livingston J., Palle E., Quinn S.N.,
Schwarz R.P., Seager S., Shporer A., Stassun K.G., Striegel S.,
Van Eylen V., Watkins C.N., Winn J.N., Ziegler C.
<Astron. Astrophys. 697, A169 (2025)>
=2025A&A...697A.169C 2025A&A...697A.169C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Stars, G-type ;
Spectroscopy ; Optical
Keywords: techniques: photometric - techniques: radial velocities -
planets and satellites: detection - stars: individual: TOI-3493 -
stars: solar-type
Abstract:
We report the discovery of TOI-3493 b, a sub-Neptune-sized planet on
an 8.15-d orbit transiting the bright (V=9.3) G0 star HD 119355 (aka
TIC 203377303) initially identified by NASA's TESS space mission. With
the aim of confirming the planetary nature of the transit signal
detected by TESS and determining the mass of the planet, we performed
an intensive Doppler campaign with the HARPS spectrograph, collecting
radial velocity measurements. We found that TOI-3493 b lies in a
nearly circular orbit and has a mass of 9.0±1.2M⊕ and a
radius of 3.22±0.08R⊕, implying a bulk density of
1.47+0.23-0.22g/cm3, consistent with a composition comprising a
small solid core surrounded by a thick H/He-dominated atmosphere.
Description:
We used the High Accuracy Radial velocity Planet Searcher (HARPS)
spectrograph to measure precise RVs for the target. A total of 83
high-resolution spectra, spanning from 16 February, 2022, to 17
August, 2023 (UT), were acquired as part of our extensive observing
campaigns 106.21TJ.001 and 1102.C-0923, dedicated to the follow-up of
TESS transiting planets (PI: D. Gandolfi). These spectra were obtained
at a resolving power of R∼115000, covering the wave- length range of
378-691 nm, with exposure times ranging between 1200 and 1800s,
contingent upon prevailing sky and seeing conditions. The median
signal-to-noise ratio (S/N) of the processed spectra is approximately
86 per pixel at 550nm.
This table presents the HARPS radial velocity (RV) measurements and
spectroscopic activity indicators for TOI-3493. Time stamps are in
barycentric Julian day (BJD) in barycentric dynamical time (TDB). The
RV measurements extracted using two pipelines (DRS and TERRA) are
listed along with their respective uncertainties. For each RV data
point, exposure time in seconds and signal to noise ratio (SNR) per
pixel at 550nm are given. The measurements of two profile diagnostics
of the cross-correlation function, namely, the
full-width-at-half-maximum (FWHM) and the bisector inverse slope
(BIS), are provided along with four stellar activity indicators:
CaII H&K (logR'HK), Halpha, NaI D1 and D2 lines.
Objects:
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RA (2000) DE Designation(s)
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13 43 11.71 -22 35 06.4 TOI-3493 = HD 119355
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 101 82 HARPS radial velocity measurements and
spectroscopic activity indicators for TOI-3493
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD Barycentric Julian date in the barycentric
dynamical time standard
16- 22 F7.4 km/s RV-DRS HARPS DRS radial velocity
24- 29 F6.4 km/s e_RV-DRS HARPS DRS radial velocity error
31- 37 F7.4 km/s RV-TERRA HARPS TERRA relative radial velocity
39- 44 F6.4 km/s e_RV-TERRA HARPS TERRA relative radial velocity error
46- 49 I4 s ExpTime Exposure time
51- 53 I3 --- SNR Signal-to-noise ratio (at 550nm)
55- 61 F7.4 km/s BIS Bisector inverse slope (1)
63- 68 F6.4 --- FWHM Full-width-at-half-maximum (1)
70- 76 F7.4 --- logR'HK logR'HK stellar activity indicator
78- 83 F6.4 --- e_logR'HK logR'HK stellar activity indicator error
85- 89 F5.3 --- Halpha Hα stellar activity indicator (1)
91- 95 F5.3 --- NaID1 NaID1 stellar activity indicator (1)
97-101 F5.3 --- NaID2 NaID2 stellar activity indicator (1)
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Note (1): When not mentioned, error bars are of the order of 10% on
individual values in the table.
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Acknowledgements:
Priyanka Chaturvedi, priyanka.chaturvedi(at)tifr.res.in
(End) Patricia Vannier [CDS] 17-Apr-2025