J/MNRAS/548/G671 Asteroseismology of 19000 TESS red giants (Sreenivas+, 2026)
Global asteroseismology of 19000 red giants in the TESS Continuous
Viewing Zones.
Sreenivas K.R., Bedding T.R., Huber D., Stello D., Hon M., Reyes C., Li Y.,
Hey D.
<Mon. Not. R. Astron. Soc. 548, G671 (2026)>
=2026MNRAS.548ag671S (SIMBAD/NED BibCode)
ADC_Keywords: Asteroseismology ; Stars, giant ; Optical
Keywords: stars: late-type - asteroseismology - methods: data analysis -
(Galaxy:) solar neighbourhood
Abstract:
Transiting Exoplanet Survey Satellite (TESS) has produced long-term
photometry for millions of stars across the sky. In this work, we
present an asteroseismic catalogue of 19151 red giants in the TESS
Continuous Viewing Zones using sectors 1-87 (Years 1-7). We visually
assessed the power spectra for oscillations, and then applied the
computationally efficient nuSYD method to confirm reliability. We
identified an increase of 80% in the number of previously known
oscillating red giants at a TESS magnitude >8. We determined the
frequency of maximum power (numax) and the large frequency separation
(deltanu) using the pySYD pipeline, achieving typical precisions of
1.5% and 1.0%, respectively. We classified the stars into Red Giant
Branch (RGB) and Core Helium Burning (CHeB) classes using a
Convolutional Neural Network. Using spectroscopic data for 10,298
stars with reliable asteroseismic measurements, we have been able to
measure stellar mass and radii with precisions of 7.5% and 2.8%, which
is comparable to that from 4-yr Kepler data. A comparison of the
seismic radii with Gaia radii shows excellent agreement. With three
years of TESS data, the asteroseismic parameters are precise enough to
identify the RGB bump and delineate the Zero Age Helium Burning edge.
Combined with astrometric data, these parameters reveal established
trends across the Galactic plane, providing a valuable set of
uniformly determined asteroseismic parameters for Galactic
Archaeology.
Description:
In this work, we utilized the long-duration light curves available for
the TESS Continuous Viewing Zones in Sectors 1-87 to compile a
catalogue of 19151 oscillating red giants. The catalogue provides
homogeneously derived frequency of maximum power (numax), large
frequency separation (δnu, evolutionary state classifications,
astero- seismic masses, radii, and logg values.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 512 19151 Catalogue of asteroseismic parameters for
19151 oscillating red giants in the TESS CVZs
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 I10 --- TIC TESS Input Catalog ID
12- 30 I19 --- GaiaDR2 Source ID from GAIA DR2
32- 46 F15.11 deg ELON Ecliptic longitude (ICRS) at Ep=2015.5
48- 62 F15.11 deg ELAT Ecliptic latitude (ICRS) at Ep=2015.5
64- 69 F6.3 mag Tmag TESS magnitude
71- 72 I2 --- Nsectors Number of TESS sectors
74- 92 F19.14 d TimeSpan Effective time span of TESS light curve
94-113 F20.16 uHz numax Frequency of Maximum Power
115-133 F19.16 uHz e_numax ?=- Uncertainty in Frequency of maximum
power
135-153 F19.16 uHz deltanu ?=- Large Frequency Separation
155-178 E24.16 uHz e_deltanu ?=- Uncertainty in Large Frequency
Separation
180 I1 --- f_deltanu [0/1]?=- Flag indicating the reliable
deltanu (1 = reliable and 0 = unreliable)
182-205 E24.16 --- pdeltanu ?=- delta_nu Vetting probability
207 I1 --- State [0/2]?=- Evolutionary state
(1 = RGB, 2 = CHeB and 0 = ambiguous)
209-232 E24.16 --- StateSc ?=- Evolutionary state prediction score
234-256 E23.15 --- pdet ?=- Detection probability
258 I1 --- blendFlag [0/1] Flag indicating whether the star is
a potential blend
(0 = a potential blend and 1 = non blend)
260-265 F6.1 K Teff ?=- Effective Temperature
267-276 F10.6 K e_Teff ?=- Uncertainty in Effective Temperature
278-282 F5.3 [cm/s2] loggSpec ?=- Spectroscopic Surface gravity
284-302 F19.17 [cm/s2] e_loggSpec ?=- Uncertainty in Spectroscopic Surface
Gravity
304-309 F6.3 [-] [Fe/H] ?=- Metallicity
311-314 F4.2 [-] e_[Fe/H] ?=- Uncertainty in Metallicity
316 I1 --- SpecSource [1/2]?=- Source of Spectroscopic data
1 = APOGEE/GALAH/RAVE and 2 = XP Spectra)
318-338 F21.16 Msun Massuncor ?=- Uncorrected Mass
340-359 F20.16 Rsun Radsuncor ?=- Uncorrected Radius
361-378 F18.16 --- fdeltanu ?=- Correction factor for deltanu scaling
relation
380-401 F22.17 Msun Mass ?=- Stellar mass
403-425 F23.18 Msun e_Mass ?=- Uncertainty in stellar mass
427-446 F20.16 Rsun Rad ?=- Stellar Radius
448-469 F22.17 Rsun e_Rad ?=- Uncertainty in stellar radius
471-488 F18.16 [cm/s2] loggSeismic ?=- Surface Gravity
490-510 F21.19 [cm/s2] e_loggSeismic ?=- Uncertainty on surface gravity
512 I1 --- GoldSample [0/1] Whether member of gold sample
(1 = member and 0 = non member)
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Acknowledgements:
K.R. Sreenivas, skal9597(at)uni.sydney.edu.au
License: CC-BY-4.0 [see https://spdx.org/licenses/]
(End) Patricia Vannier [CDS] 13-Apr-2026