J/A+A/663/A45 Discovery of new TESS pulsating hot subdwarfs (Krzesinski+, 2022)
Discovery of new TESS pulsating hot subdwarfs.
Krzesinski J., Balona L.A.
<Astron. Astrophys., 663, A45 (2022)>
=2022A&A...663A..45K 2022A&A...663A..45K (SIMBAD/NED BibCode)
ADC_Keywords: Stars, subdwarf ; Effective temperatures ; Abundances ; Optical
Keywords: subdwarfs - stars: oscillations
Abstract:
This work is dedicated to a search for new pulsating hot subdwarfs in
TESS photometric data which could have been missed in previous
searches.
By matching catalogues of hot subdwarfs with TESS targets and using
luminosities from Gaia parallaxes, a list of 1389 candidate hot
subdwarfs observed by TESS was created. The periodograms of these
stars were inspected, and the stars were classified according to
variability type.
An updated catalogue of all known pulsating hot subdwarfs is
presented. A number of probable pulsating binaries have been
identified, which might prove useful for verifying the asteroseismic
masses. The mean masses of p- and g-mode pulsators are estimated from
the stellar parameters.
A list of 63 previously unknown pulsating hot subdwarfs observed by
TESS is presented. More than half of the stars previously identified
as pure p-mode pulsators are found to have frequencies in the g-mode
region as well. As a result, hybrid p- and g-mode pulsators occur over
the whole instability strip.
Description:
A list of all known pulsating sdB stars was compiled by Holdsworth et
al. (2017MNRAS.466.5020H 2017MNRAS.466.5020H). This list was extended by a literature
search, supplemented with the lists from Van Grootel et al.
(2021A&A...650A.205V 2021A&A...650A.205V, Cat. J/A+A/650/A205) and presented in Table A.1.
By cross-matching the positions of stars observed by TESS with the
lists of subdwarf candidates by Geier (2020A&A...635A.193G 2020A&A...635A.193G, Cat.
J/A+A/635/A193), a total of 1398 stars with TESS light curves was
obtained. Using the stellar luminosities derived from Gala parallaxes,
stars not likely to be hot subdwarfs were identified and removed from
the sample.
The periodograms of these stars were inspected and stars classified
according to variability type. Pulsating hot subdwarfs are identified
by the presence of multiple peaks in the periodogram. Many other stars
showing only one peak below 30d-1, or one peak and its harmonics,
are assumed to be binaries.
In this way, 63 pulsating hot subdwarfs were detected, 38 of which are
listed in Van Grootel et al. (2021A&A...650A.205V 2021A&A...650A.205V,
Cat. J/A+A/650/A205), but not classified as pulsating variables. The
remaining 25 stars are previously unknown pulsating hot subdwarf
candidates. This is a significant increase in the number of pulsating
subdwarfs presented by the WG8 work. The new variables are presented
in Tables A.2 and A.3.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 72 21 Stars in Holdsworth et al. (2017MNRAS.466.5020H 2017MNRAS.466.5020H)
classified as pure p-mode pulsators but which have
clear g-mode frequency peaks in the TESS photometry
tablea1.dat 100 74 Pulsating hot subdwarfs discovered since
Holdsworth et al. (2017MNRAS.466.5020H 2017MNRAS.466.5020H)
tablea2.dat 98 38 List of 38 newly discovered pulsating sdB stars
not marked as pulsators in the Van Grootel et al.
(2021A&A...650A.205V 2021A&A...650A.205V, Cat. J/A+A/650/A205)
catalogue
tablea3.dat 103 25 List of 25 newly discovered TESS pulsating sdB
candidates that are not listed in Van Grootel
et al. (2021A&A...650A.205V 2021A&A...650A.205V, Cat. J/A+A/650/A205)
notes.dat 80 86 Individual notes
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See also:
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Flag [pN] Flag (1)
3- 11 I9 --- TIC TIC number
13- 38 A26 --- Name Name
40- 44 F5.1 kK Teff ?=- Effective temperature form Holdsworth et
al. (2017MNRAS.466.5020H 2017MNRAS.466.5020H)
46- 48 F3.1 kK e_Teff ? Effective temperature error
50- 53 F4.2 [Lsun] logL Luminosity
55- 58 F4.2 [Lsun] e_logL Luminosity error
60- 72 A13 --- SpType Spectral type from the literature
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Note (1): Flag as follows:
p = p-mode sdBV reclassified as hybrid pulsators
N = New binary candidates (known sdBV stars in which binary variation
may be present)
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Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 I9 --- TIC ?=- TIC number
11- 34 A24 --- Name Name
36- 38 A3 --- Type Pulsation type (1)
39- 44 F6.2 kK Teff ?=- Effective temperature
(from Gaia EDR3 parallaxes) (2)
46- 49 F4.2 kK e_Teff ? Effective temperature error
51- 54 F4.2 [Lsun] logL ?=- Luminosity (from Gaia EDR3 parallaxes)
56- 59 F4.2 [Lsun] e_logL ? Luminosity error
61- 64 F4.2 [cm/s2] logg ?=- Surface gravity (from Geier,
2020A&A...635A.193G 2020A&A...635A.193G, Cat. J/A+A/635/A193)
66- 69 F4.2 [cm/s2] e_logg ? Surface gravity error
71- 75 F5.2 [-] logY ?=- Helium abundance Y=n(He)/n(H)
(from Geier, 2020A&A...635A.193G 2020A&A...635A.193G,
Cat. J/A+A/635/A193)
77- 80 F4.2 [-] e_logY ? Y abundance error
82- 83 I2 --- r_Type Pulsation reference (3)
85-100 A16 --- r_Teff Effective temperature reference (3)
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Note (1): The pulsation type is either P (p-mode), G (g-mode), or H
(both p- and g-modes present). Suspected binary systems are labelled B.
Note (2): If no value of Teff is available, the calculation of the luminosity
assumes Teff=3.0kK.
Note (3): References as follows:
1 = Heber et al. (1984A&A...130..119H 1984A&A...130..119H)
2 = Heber (1986A&A...155...33H 1986A&A...155...33H)
3 = Kilkenny et al. (1988SAAOC..12....1K 1988SAAOC..12....1K, Cat. III/137)
4 = Saffer et al. (1994ApJ...432..351S 1994ApJ...432..351S)
5 = Kilkenny et al. (1995MNRAS.276..906K 1995MNRAS.276..906K)
6 = Hilditch et al. (1996MNRAS.279.1380H 1996MNRAS.279.1380H)
7 = Edelmann et al. (2003A&A...400..939E 2003A&A...400..939E, Cat. J/A+A/400/939)
8 = Sanchez-Blazquez et al. (2006MNRAS.371..703S 2006MNRAS.371..703S, Cat. J/MNRAS/371/703)
9 = Reed et al. (2007ApJ...664..518R 2007ApJ...664..518R)
10 = Ostensen et al. (2010A&A...513A...6O 2010A&A...513A...6O, Cat. J/A+A/513/A6)
11 = Prugniel et al. (2011A&A...531A.165P 2011A&A...531A.165P, Cat. J/A+A/531/A165)
12 = Vennes et al. (2011MNRAS.410.2095V 2011MNRAS.410.2095V)
13 = Girven et al. (2011MNRAS.417.1210G 2011MNRAS.417.1210G, Cat. J/MNRAS/417/1210)
14 = Nemeth et al. (2012MNRAS.427.2180N 2012MNRAS.427.2180N, Cat. J/MNRAS/427/2180)
15 = Geier (2013A&A...549A..11O 2013A&A...549A..11O)
16 = Geier et al. (2013A&A...557A.122G 2013A&A...557A.122G)
17 = Kupfer et al. (2015A&A...576A..44K 2015A&A...576A..44K, Cat. J/A+A/576/A44)
18 = Kepler et al. (2015MNRAS.446.4078K 2015MNRAS.446.4078K, Cat. J/MNRAS/446/4078)
19 = Soubiran et al. (2016A&A...591A.118S 2016A&A...591A.118S, Cat. B/pastel)
20 = Bachulski et al. (2016AcA....66..455B 2016AcA....66..455B)
21 = Luo et al. (2016ApJ...818..202L 2016ApJ...818..202L, Cat. J/ApJ/818/202)
22 = Perez-Fernandez et al. (2016MNRAS.457.3396P 2016MNRAS.457.3396P, Cat. J/MNRAS/457/3396)
23 = Baran et al. (2017A&A...597A..95B 2017A&A...597A..95B)
24 = Jeffery et al. (2017MNRAS.465.3101J 2017MNRAS.465.3101J)
25 = Corsico et al. (2021A&A...645A.117C 2021A&A...645A.117C)
26 = Lei et al. (2018ApJ...868...70L 2018ApJ...868...70L, Cat. J/ApJ/868/70)
27 = Reed et al. (2018MNRAS.474.5186R 2018MNRAS.474.5186R)
28 = Baran et al. (2018MNRAS.481.2721B 2018MNRAS.481.2721B)
29 = Reed et al. (2018, Open Astron, 27, 157)
30 = Arentsen et al. (2019A&A...627A.138A 2019A&A...627A.138A, Cat. J/A+A/627/A138)
31 = Anders et al. (2019A&A...628A..94A 2019A&A...628A..94A, Cat. I/349)
32 = Charpinet et al. (2019A&A...632A..90C 2019A&A...632A..90C)
33 = Lei et al. (2019ApJ...881..135L 2019ApJ...881..135L, Cat. J/ApJ/881/135)
34 = Reed et al. (2019MNRAS.483.2282R 2019MNRAS.483.2282R, Cat. J/MNRAS/483/2282)
35 = Kilkenny et al. (2019MNRAS.485.4330K 2019MNRAS.485.4330K)
36 = Kepler et al. (2019MNRAS.486.2169K 2019MNRAS.486.2169K, Cat. 2019MNRAS.486.2169K 2019MNRAS.486.2169K)
37 = Latour et al. (2019A&A...623L..12L 2019A&A...623L..12L, Cat. J/A+A/623/L12)
38 = Silvotti et al. (2019MNRAS.489.4791S 2019MNRAS.489.4791S)
39 = Pelisoli et al. (2020A&A...642A.180P 2020A&A...642A.180P, Cat. J/A+A/642/A180)
40 = Reed et al. (2010MNRAS.409.1496R 2010MNRAS.409.1496R)
41 = Sahoo et al. (2020MNRAS.495.2844S 2020MNRAS.495.2844S)
42 = Ostensen et al. (2020MNRAS.499.3738O 2020MNRAS.499.3738O)
43 = Uzundag et al. (2021A&A...651A.121U 2021A&A...651A.121U)
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Byte-by-byte Description of file: tablea2.dat tablea3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 I9 --- TIC TIC number
10 A1 --- n_TIC [*] indicates a note in notes.dat file
12- 33 A22 --- Name Name
35- 37 A3 --- Type Pulsation type
39- 43 F5.2 kK Teff ?=- Effective temperature
45- 48 F4.2 kK e_Teff ? Effective temperature error
50- 57 A8 --- r_Teff Effective temperature reference (3)
59- 63 F5.2 [Lsun] logL Luminosity
65- 68 F4.2 [Lsun] e_logL Luminosity error
70- 73 F4.2 [cm/s2] logg ?=- Surface gravity
75- 78 F4.2 [cm/s2] e_logg ? Surface gravity error
80- 84 F5.2 [-] logY ?=- Helium abundance Y=n(He)/n(H)
(from Geier, 2020A&A...635A.193G 2020A&A...635A.193G,
Cat. J/A+A/635/A193)
86- 89 F4.2 [-] e_logY ? Y abundance error
91 I1 --- F [1/3] Flag (1)
93-103 A11 --- SpType Spectral type (2)
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Note (1): Flag as follows:
1 = an isolated target or target star with neighbours that have no
influence on the target fluxes
2 = a crowded field where the target flux is not substantially polluted
by light from neighbouring stars
3 = a star with bright neighbours that might substantially affect the
amplitudes of the subdwarf light variation.
Note (2): Spectral type from Van Grootel et al. (2021A&A...650A.205V 2021A&A...650A.205V,
Cat. J/A+A/650/A205) in tablea2, from literature in tablea3.
Note (3): References as follows:
48 = Moehler et al. (1990A&A...239..265M 1990A&A...239..265M)
49 = Ramspeck et al. (2001A&A...379..235R 2001A&A...379..235R)
50 = Maxted et al. (2001MNRAS.326.1391M 2001MNRAS.326.1391M)
51 = Arkhipova et al. (2002AstL...28..778A 2002AstL...28..778A)
52 = Vos et al. (2013A&A...559A..54V 2013A&A...559A..54V)
53 = Moni Bidin et al. (2017MNRAS.466.3077M 2017MNRAS.466.3077M)
54 = Geier et al. (2017, Open Astron., 26, 164)
55 = Bai et al. (2018ApJS..235...16B 2018ApJS..235...16B, Cat. J/ApJS/235/16)
56 = Luo et al. (2019ApJ...881....7L 2019ApJ...881....7L)
57 = Geier (2020A&A...635A.193G 2020A&A...635A.193G, Cat. J/A+A/635/A193)
58 = Tian et al. (2020ApJS..249...22T 2020ApJS..249...22T, Cat. J/ApJS/249/22)
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 I9 --- TIC Tic number
11- 80 A70 --- Note Text of the note
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 30-Sep-2022