J/ApJ/924/117 Rotation signature of TESS B-type stars (Barraza+, 2022)
Rotation signature of TESS B-type stars. A comprehensive analysis.
Barraza L.F., Gomes R.L., Messias Y.S., Leao I.C., Almeida L.A.,
Janot-Pacheco E., Brito A.C., Brito F.A.C., Santana J.V., Goncalves N.S.,
das Chagas M.L., Teixeira M.A., De Medeiros J.R., Canto Martins B.L.
<Astrophys. J., 924, 117 (2022)>
=2022ApJ...924..117B 2022ApJ...924..117B
ADC_Keywords: Stars, variable; Effective temperatures; Photometry; Optical;
Stars, B-type; Asteroseismology
Keywords: Stellar rotation ; Stellar photometry ; Variable stars
Abstract:
Stellar rotation is a fundamental observable that drives different
aspects of stellar and planetary evolution. In this work, we present
an unprecedented manifold analysis of 160 B-type stars with light
curves collected by the TESS space mission using three different
procedures (fast Fourier transform, Lomb-Scargle, and wavelet
techniques), accompanied by rigorous visual inspection in the search
for rotation periodicities. This effort provides rotational
periodicities for 6 new TESS B-type stars and confirmed periodicities
for 22 targets with rotation periods previously listed in the
literature. For the other 61 stars, already classified as possible
rotational variables, we identify noisy, pulsational, binarity, or
ambiguous variability behavior rather than rotation signatures. The
total sample of 28 potential rotators shows an overlap of different
classes of rotational variables, composed of α2 Canum
Venaticorum, rotating ellipsoidal, and SX Arietis stars. The
combination of the three techniques applied in our analysis offers a
solid path to overcome the challenges in the discrimination of
rotation from other variabilities in stellar light curves, such as
pulsation, binarity, or other effects that have no physical meaning.
Finally, the rotational periodicities reported in the present study
may represent important constraints for improving stellar evolution
models with rotation, as well as asteroseismic studies of hot stars.
Description:
The Transiting Exoplanet Survey Satellite (TESS) space mission
produces high-precision photometry of millions of stars. The mission
provides photometric data at different cadences, namely 2 and 30min in
Cycles 1 and 2, and 20s, 2 minutes, and 10 minutes in Cycle 3, with a
time baseline from 27 to 351 days, depending on sector overlaps.
For the purpose of the present work, we chose 160 B-type stars with
LCs collected by the TESS mission and previously analyzed by
Balona & Ozuyar (2020, J/MNRAS/493/5871) in the search for rotation
periodicities probably using the Lomb-Scargle technique. Among these
stars, 154 were analyzed by Pedersen+ (2019, J/ApJ/872/L9).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 73 160 List of 160 TESS B-type stars
table2.dat 84 28 TESS B-type stars with rotation periodicity
from the combined analysis of fast Fourier
transform (FFT), Lomb-Scargle, and Wavelet
--------------------------------------------------------------------------------
See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/MNRAS/392/1456 : VIc phot. of M50 (NGC 2323) low-mass stars (Irwin+, 2009)
J/A+A/499/567 : BV differential photometry of HR 7224 (Krticka+, 2009)
J/MNRAS/431/2240 : Activity in A-type stars from Kepler (Balona, 2013)
J/A+A/555/A63 : Semi-sinusoidal variability with CoRoT (de Medeiros+, 2013)
J/A+A/560/A4 : Rotation periods of active Kepler stars (Reinhold+, 2013)
J/ApJS/211/24 : Rotation periods of Kepler MS stars (McQuillan+, 2014)
J/A+A/583/A122 : Var. behaviour of CoRoT M-giant stars (Ferreira+, 2015)
J/ApJ/803/69 : Kepler planetary host stars rot. per. (Paz-Chinchon+, 2015)
J/ApJS/239/2 : Simulated exoplanets from TESS (Barclay+, 2018)
J/MNRAS/475/5144 : Magnetic early B-type stars. I. (Shultz+, 2018)
J/MNRAS/485/3457 : Rotational modulation in TESS B stars (Balona+, 2019)
J/A+A/623/A110 : Gaia DR2. Variable stars in CMD (Gaia Collaboration+, 2019)
J/ApJ/872/L9 : TESS obs. of massive O and B stars (Pedersen+, 2019)
J/A+A/622/A72 : Intermediate-mass T Tau stars spectra (Villebrun+, 2019)
J/MNRAS/493/5871 : TESS A and B stars and the Maia variables (Balona+, 2020)
J/ApJS/250/20 : Rotation periods of TOIs (Canto+, 2020)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 10 I9 -- TIC [12359289/469906369] TIC ID
12- 18 I7 K Teff [9012/42000]? Effective temperature from
Balona+ (2019, J/MNRAS/485/3457)
20- 26 F7.3 mag Gmag [-4.54/1.74]? Gaia DR2 G-band magnitude (2)
28- 34 F7.3 mag BP-RP [-0.36/3.16]? Gaia BP-RP color index (2)
36- 73 A38 -- Sectors TESS Sectors
--------------------------------------------------------------------------------
Note (2): From Pedersen+ (2019, J/ApJ/872/L9).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 I9 --- TIC [12359289/469906369] TIC ID
11- 15 F5.3 d ProtB19 [0.34/5.21]? rotation period (P'rot) from
Balona+ (2019, J/MNRAS/485/3457) (1)
17- 24 F8.6 d Prot [0.32/5.2] Rotation period from this work
26- 33 F8.6 d e_Prot [0/0.008] Prot uncertainty
35- 37 I3 % LSP [49/100] Level of signature persistence
39- 41 I3 d Tspan [25/362] Effective time span
43- 48 F6.1 --- Ncyc [8.4/1042.8] Effective number of cycles
from our analysis
50- 60 A11 --- ClB19 Classification from
Balona+ (2019, J/MNRAS/485/3457)
62- 82 A21 --- ClP19 Classification from
Pedersen+ (2019, J/ApJ/872/L9)
84 A1 --- Note Note (2)
--------------------------------------------------------------------------------
Note (1): The parameter P'rot was obtained from the frequency vrot given
by Balona+ (2019, J/MNRAS/485/3457).
Note (2): Remarks from our analysis as follows:
a = rotation + EB
b = rotation + multiflares
c = rotation + pulsation
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 21-Aug-2023