J/AJ/167/1 Transit depth variability with TESS (Wang+, 2024)
A Blind Search for Transit Depth Variability with TESS.
Wang G., Espinoza N.
<Astron. J., 167, 1 (2024)>
=2024AJ....167....1W 2024AJ....167....1W
ADC_Keywords: Exoplanets; Photometry; Optical
Keywords: Exoplanets ; Catalogs ; Transit photometry
Abstract:
The phenomenon of transit depth variability offers a pathway through
which processes such as exoplanet atmospheric activity and orbital
dynamics can be studied. In this work we conduct a blind search for
transit depth variations among 330 known planets observed by the
Transiting Exoplanet Survey Satellite within its first four years of
operation. Through an automated periodogram analysis, we identify four
targets (KELT-8b, HAT-P-7b, HIP 65 Ab, and TrES-3b) that appear to
show significant transit depth variability. We find that KELT-8b's
transit depth variability likely comes from contaminating flux from a
nearby star, while the apparent variabilities of HIP65Ab and TrES-3b
are probable artifacts due to their grazing orbits. HAT-P-7b indicates
signs of variability that possibly originate from the planet or its
host star. A population-level analysis does not reveal any significant
correlation between transit depth variability and the effective
temperature and mass of the host star; such correlation could arise if
stellar activity was the cause of depth variations via the transit
light source effect. Extrapolating our ∼1% detection rate to the
upcoming Roman mission, predicted to yield of order 100000 transiting
planets, we expect that ∼1000 of these targets will be found to
exhibit significant transit depth variability.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 48 330 Results for all planets in our sample
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See also:
J/A+A/478/507 : Distances & atmospheric parameters MSU stars (Morales+, 2008)
J/A+A/628/A115 : WASP-12, CoRoT-1 and TrES-3 light curves (von Essen+, 2019)
J/ApJS/259/62 : TESS transit timing of hot Jupiters (Ivshina+, 2022)
J/AJ/163/228 : Limb-darkening coeffi of 176 TESS exoplanets (Patel+, 2022)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Name of the planet
17- 21 I5 ppm Depth [239/98012] Median transit depth
23- 27 I5 ppm e_Depth [47/11796] Uncertainty in Depth (1)
29- 32 I4 ppm AbsVar [29/8389] Standard deviation of transit
depths (1)
34- 38 A5 --- NR ? Nested ratio
40- 44 A5 --- e_NR ? Uncertainty in NR
46- 48 I3 --- Transits [5/216] Number of transits
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Note (1): The median per-point uncertainty of the transit depths (median formal
error) is different from the standard deviation of the transit depths,
the latter of which we call the "absolute transit depth variability"
in the paper to avoid confusion.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 18-Apr-2024