J/A+A/662/A82 Period-spacing patterns in TESS southern CVZ (Garcia+, 2022)
Detection of period-spacing patterns due to the gravity modes of rotating dwarfs
in the TESS southern continuous viewing zone.
Garcia S., Van Reeth T., De Ridder J., Tkachenko A., IJspeert L.W., Aerts C.
<Astron. Astrophys. 662, A82 (2022)>
=2022A&A...662A..82G 2022A&A...662A..82G (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Stars, dwarfs
Keywords: asteroseismology - catalogs - stars: interiors - stars: rotation -
stars: variables: general
Abstract:
The theory of stellar evolution presents shortcomings when confronted
with asteroseismic probes of interior physical properties. The
differences between observations and theory are often great because
stellar models have mainly been calibrated from observables connected
to the surface of stars. Period-spacing patterns caused by gravity
modes are a particularly powerful asteroseismic tool that are useful
for probing the near-core rotation and mixing of chemical elements in
main-sequence stars with convective cores.
We aim to compose a catalog of intermediate-mass stars in the
Transiting Exoplanet Survey Satellite (TESS) southern continuous
viewing zone (CVZ) to reveal period-spacing patterns caused by gravity
modes for use in future asteroseismic modeling.
TESS full frame images (FFI) were inspected to select stars of
intermediate- and high-mass using color-magnitude criteria. Light
curves were extracted from custom masks per star, adopting stringent
constraints on the aperture masks and contamination. The extracted
light curves were subject to iterative prewhitening to detect gravity
modes. We developed a method relying on the assumption that period
spacings are an approximately linear function of the mode periods to
build a template pattern. This template was used to extract the
patterns and their uncertainties, relying on a bootstrap approach.
Our TESS catalog of high-quality period-spacing patterns is the first
of its kind and contains 140 gravity-mode patterns in 106 γ Dor
stars and two slowly pulsating B-type (SPB) stars. Half of these
patterns contain seven or more measured mode periods and the longest
pattern contains 20 modes. We provide the community with a convenient
software tool to search for period-spacing patterns and to process the
extracted light curves.
Our catalog offers a fruitful starting point for future gravity-mode
asteroseismology of rotating dwarfs with convective cores in the
southern hemisphere.
Description:
Our final catalog of g-mode pulsators revealing period-spacing
patterns consists of 108 bright dwarfs in the TESS southern CVZ. These
stars revealed a total of 140 resolved period-spacing patterns.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea2.dat 128 140 Period-spacing patterns catalog
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See also:
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- TIC TESS Input Catalog number (TIC_ID)
11- 15 F5.2 mag Tmag TESS Magnitude
17- 21 F5.3 d Pmean Mean period
23- 26 F4.2 ks e_Pmean Mean period spacing
28- 37 F10.8 d P0 Parameter P0 fitted to the pattern
39- 48 F10.8 d e_P0 One-sigma negative error of P0
50- 59 F10.8 d E_P0 One-sigma positive error of P0
61- 68 F8.6 ks dP0 Parameter dP0 fitted to the pattern
70- 77 F8.6 ks e_dP0 One-sigma negative error of dP0
79- 86 F8.6 ks E_dP0 One-sigma positive error of dP0
88- 98 F11.8 --- alpha Parameter alpha fitted to the pattern
100-109 F10.8 --- e_alpha One-sigma negative error of alpha
111-120 F10.8 --- E_alpha One-sigma positive error of alpha
122-123 I2 --- Nperiods Number of detected periods in the pattern
125-126 I2 --- Nspan Range of overtones in the model pattern
128 A1 --- Hybrid [Y] Y = Hybrid pulsators
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Acknowledgements:
Stefano Garcia, stefanorenzo.garciacastaneda(at)kuleuven.be
(End) Patricia Vannier [CDS] 07-Mar-2022