J/ApJS/279/37 Asteroseismology of 687 TESS red giants (Zhou+, 2025)
Asteroseismology of 687 TESS red giants: individual frequencies and asymptotic
parameters.
Zhou J., Bi S., Li Y., Yu J., Li T., Zhang X., Ye L., Li M., Long L.,
Sun T., Chen Y.
<Astrophys. J. Suppl. Ser., 279, 37 (2025)>
=2025ApJS..279...37Z 2025ApJS..279...37Z
ADC_Keywords: Asteroseismology; Stars, giant; Photometry; Optical
Keywords: Asteroseismology ; Giant stars ; Low mass stars
Abstract:
The individual modes and asymptotic parameters are important
characteristics of stellar oscillation. Using TESS 2 minute cadence
data from Sectors 1 to 75, we perform asteroseismic analysis of
687 red giants, and provide their oscillation mode parameters. The
mode parameters, including frequencies νn,l, amplitudes An,l,
and line widths Γn,l, are obtained through Markov Chain Monte
Carlo fitting. The median uncertainty for frequency is 0.047µHz.
Using the radial mode frequencies, we calculate the values of
Δν, and derive asymptotic parameters (εp, εc,
δν0l, q, and ΔΠ1) based on l=0,1,2 modes. For red
giants with Δν>15.6µHz, there is a weaker correlation
between δν02 and Δν, and a stronger mass dependence,
compared to stars with lower Δν. Additionally, the ratio
δν02/Δν presents a pronounced increase with
Δν decrease, as these stars undergo rapid core contraction
and their convective envelopes extend deep into the interior. At this
stage, the ratio δν02/Δν may serve as a robust
indicator for diagnosing the location of the convective boundary.
Furthermore, the εc values can be a potential index to
distinguish red clump (RC) and secondary RC stars from red giant
branch stars in the TESS field.
Description:
In this work, based on the sample of 8617 solar-like oscillators from
Zhou+ (2024, J/ApJS/271/17), we use TESS 2 minute cadence data from
Sectors 1 (2018-Jul-25) to 75 (2024-Feb-26) to perform individual mode
fitting, and extract radial (l=0), dipole (l=1), and quadrupole (l=2)
modes.
All 2 minute cadence light curves were downloaded from the Mikulski
Archive for Space Telescopes (MAST).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 61 12278 Mode parameters obtained from mode fitting
table2.dat 94 687 Stellar oscillation parameters
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See also:
IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)
IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)
J/A+A/540/A143 : Oscillations of red giants observed by Kepler (Mosser+, 2012)
J/ApJ/765/L41 : Asteroseismic classification of KIC objects (Stello+, 2013)
J/ApJS/210/1 : Asteroseismic study of solar-type stars (Chaplin+, 2014)
J/ApJS/211/2 : Revised properties of Q1-16 Kepler targets (Huber+, 2014)
J/ApJ/827/50 : Kepler faint red giants (Mathur+, 2016)
J/AJ/152/158 : Final Kepler transiting planet search (DR25) (Twicken+, 2016)
J/MNRAS/463/1297 : Asteroseismology of misclassified red giants (Yu+, 2016)
J/ApJ/835/172 : Kepler asteroseismic LEGACY sample. I. (Lund+, 2017)
J/A+A/600/A1 : Coupling factors of 5166 KIC (Mosser+, 2017)
J/A+A/616/A24 : Rotation in RGBs from Kepler asteroseismology (Gehan+, 2018)
J/A+A/616/A94 : KIC red giants radial modes amp. & lifetime (Vrard+, 2018)
J/ApJS/236/42 : Asteroseismology of ∼16000 Kepler red giants (Yu+, 2018)
J/ApJS/241/12 : Asteroseismic Target List (ATL) for TESS (Schofield+, 2019)
J/MNRAS/495/2363 : Asteroseismology of 36 Kepler subgiants. I. (Li+, 2020)
J/ApJ/919/131 : Oscillating red giants from the TESS QLP (Hon+, 2021)
J/A+A/669/A67 : Solar-like oscillators catalogue (Hatt+, 2023)
J/ApJ/954/152 : Low-luminosity Kepler red giants analysis (Kuszlewicz+, 2023)
J/ApJ/953/182 : Improved stellar parameters of Kepler RGB stars (Wang+, 2023)
J/ApJS/271/17 : Solar-like oscillators using TESS LCs (Zhou+, 2024)
J/A+A/697/A165 : Evolutionay status of Kepler red giants (Vrard+, 2025)
http://archive.stsci.edu/missions-and-data/tess : TESS on MAST
http://heasarc.gsfc.nasa.gov/docs/tess/ : TESS Science Support Center
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- TIC [1713457/468827515] TESS input catalog identifier
11- 11 I1 --- l [0/2] mode
13- 19 F7.2 uHz fc [5/1450.21] mode frequency parameter νn,l
21- 24 F4.2 uHz e_fc [0/1.5] Uncertainty in fc
26- 30 F5.2 10-6 Amp [0.16/93.5]? amplitude parameters, An,l
32- 36 F5.2 10-6 e_Amp [0.1/15.5]? Uncertainty in Amp
38- 41 F4.2 uHz lw [0/4.5]? linewidth parameters, Γn,l
43- 46 F4.2 uHz e_lw [0/1.2]? Uncertainty in lw
48- 54 F7.2 --- lnK [-26/2660.21] Bayesian factor to assess
existence of a mode
56- 61 F6.2 --- e_lnK [0/238.5] Uncertainty in lnK
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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- 9 I9 --- TIC [1713457/468827515] TESS input catalog
identifier
11- 15 F5.2 uHz dnu [1.45/69.8] Large separation, Δν
17- 20 F4.2 uHz e_dnu [0.01/0.7] Uncertainty in dnu
22- 25 F4.2 --- epsc [0.43/1.7]? Dimensionless offset, εc
27- 30 F4.2 --- e_epsc [0.02/0.7]? Uncertainty in epsp
32- 36 F5.2 --- epsp [-0.32/1.63] Dimensionless offset, εp
38- 41 F4.2 --- e_epsp [0.01/0.9] Uncertainty in epsp
43- 46 F4.2 uHz d02 [0.17/6.03]? Small frequency separation,
δν02
48- 51 F4.2 uHz e_d02 [0.02/1.6]? Uncertainty in d02
53- 57 F5.2 uHz d01 [-3.3/2.1]? Small frequency spacing,
δν01
59- 63 F5.2 uHz e_d01 [0.02/75.5]? Uncertainty in d01
65- 68 F4.2 --- q [0.05/0.7]? Coupling factor
70- 73 F4.2 --- e_q [0/1.52]? Uncertainty in q
75- 80 F6.2 --- Dpi [56.8/335.7]? G-mode period spacing,
ΔΠ
82- 86 F5.2 --- e_Dpi [0.1/20.1]? Uncertainty in Dpi
88- 90 F3.1 --- evo-epsc [0/3]? Classification, using εc (1)
92- 94 F3.1 --- evo-Dpi [0/2]? Classification, using ΔΠ (2)
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Note (1): Classifications using εc as follows:
0.0 = RGB (484 occurrences)
1.0 = red clump (RC; 93 occurrences)
2.0 = secondary RC (34 occurrences)
3.0 = AGB (11 occurrences)
Note (2): Classifications using ΔΠ as follows:
0.0 = RGB (50 occurrences)
1.0 = red clump (RC; 74 occurrences)
2.0 = secondary RC (16 occurrences)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 24-Feb-2026