J/MNRAS/498/5972 Variables and dippers in young associations (Nardiello, 2020)
A PSF-based Approach to TESS High quality data Of Stellar clusters (PATHOS).
III. Exploring the properties of young associations through their variables,
dippers, and candidate exoplanets.
Nardiello D.
<Mon. Not. R. Astron. Soc., 498, 5972-5989 (2020)>
=2020MNRAS.498.5972N 2020MNRAS.498.5972N (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Stars, variable; Photometry ; Optical ;
Photometry, infrared
Keywords: techniques: image processing - techniques: photometric -
planets and satellites: general - stars: variables: general -
open clusters and associations: general
Abstract:
Young associations in star-forming regions are stellar systems that
allow us to understand the mechanisms that characterize the stars in
their early life and what happens around them. In particular, the
analysis of the discs and of the exoplanets around young stars allows
us to know the key processes that prevail in their evolution and
understand the properties of the exoplanets orbiting older stars. The
Transiting Exoplanet Survey Satellite mission is giving us the
opportunity to extract and analyse the light curves of association
members with high accuracy, but the crowding that affects these
regions makes difficult the light curve extraction. In the PATHOS
project, cutting-edge tools are used to extract high-precision light
curves and identify variable stars and transiting exoplanets in open
clusters and associations. In this work, I analysed the light curves
of stars in five young (<10Myr) associations, searching for variables
and candidate exoplanets. Using the rotational periods of the
association members, I constrained the ages of the five stellar
systems (∼2-10Myr). I searched for dippers, and I investigated the
properties of the dust that forms the circumstellar discs. Finally, I
searched for transiting signals, finding six strong candidate
exoplanets. No candidates with radius Rp<0.9RJ have been detected,
in agreement with the expectations. The frequency of giant planets
resulted to be ∼2-3 per cent, higher than that expected for field
stars (<1 per cent); the low statistic makes this conclusion not
strong, and new investigations on young objects are mandatory to
confirm this result.
Description:
Properties of variable stars and disk around "dippers" in 5 young
stellar associations (ChI, ChII, CrA, Lup and Vel).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
var.dat 413 1286 List of identified variables
dippers.dat 413 71 List of identified dippers
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
J/MNRAS/490/3806 : Exoplanets & variable stars in 47 Tuc (Nardiello+, 2019)
J/MNRAS/495/4924 : Exoplanets in Southern open clusters (Nardiello+, 2020)
https://archive.stsci.edu/hlsp/pathos : PATHOS Home Page
Byte-by-byte Description of file: var.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.6 deg RAdeg Right ascension (ICRS) at Ep=2015.5
13- 22 F10.6 deg DEdeg Declination (ICRS) at Ep=2015.5
30- 38 I9 --- TIC TESS Input Catalog ID
43- 61 I19 --- GaiaDR2 Gaia DR2 Source ID
72- 82 F11.8 d Per ?=-99.9 Period
88- 93 F6.3 mag Gmag Gaia DR2 G magnitude
99-103 F5.3 mag e_Gmag Error on Gaia DR2 G magnitude
109-114 F6.3 mag BPmag ?=0.0 Gaia DR2 GBP magnitude
120-124 F5.3 mag e_BPmag ?=0.0 Error on Gaia DR2 GBP magnitude
130-135 F6.3 mag RPmag ?=0.0 Gaia DR2 GRP magnitude
141-145 F5.3 mag e_RPmag ?=0.0 Error on Gaia DR2 GRP magnitude
151-156 F6.3 mag Tmag TESS T magnitude
162-166 F5.3 mag e_Tmag Error on TESS T magnitude
172-177 F6.3 mag Bmag ?=0.0 B Johnson magnitude
183-187 F5.3 mag e_Bmag ?=0.0 Error on B Johnson magnitude
193-198 F6.3 mag Vmag ?=0.0 V Johnson magnitude
204-208 F5.3 mag e_Vmag ?=0.0 Error on V Johnson magnitude
214-219 F6.3 mag Jmag ?=0.0 2MASS J magnitude
225-229 F5.3 mag e_Jmag ?=0.0 Error on 2MASS J magnitude
235-240 F6.3 mag Hmag ?=0.0 2MASS H magnitude
246-250 F5.3 mag e_Hmag ?=0.0 Error on 2MASS H magnitude
256-261 F6.3 mag Kmag ?=0.0 2MASS K magnitude
267-271 F5.3 mag e_Kmag ?=0.0 Error on 2MASS K magnitude
277-282 F6.3 mag W1mag ?=0.0 WISE W1 magnitude
288-292 F5.3 mag e_W1mag ?=0.0 Error on WISE W1 magnitude
298-303 F6.3 mag W2mag ?=0.0 WISE W2 magnitude
309-313 F5.3 mag e_W2mag ?=0.0 Error on WISE W2 magnitude
319-324 F6.3 mag W3mag ?=0.0 WISE W3 magnitude
330-334 F5.3 mag e_W3mag ?=0.0 Error on WISE W3 magnitude
341-345 F5.3 mag W4mag ?=0.0 WISE W4 magnitude
351-355 F5.3 mag e_W4mag Error on WISE W4 magnitude
359-364 F6.4 --- E(B-V) Reddening
369-374 F6.4 mas Plx Parallax from Gaia DR2
376-383 F8.4 mas/yr pmRA Proper motion along RA from Gaia DR2, pmRA*cosDE
385-392 F8.4 mas/yr pmDE Proper motion along Dec from Gaia DR2
410-413 A4 --- Assoc Name of the association that host the star (G1)
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Byte-by-byte Description of file: dippers.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.6 deg RAdeg Right ascension (ICRS) at Ep=2015.5
13- 22 F10.6 deg DEdeg Declination (ICRS) at Ep=2015.5
30- 38 I9 --- TIC TESS Input Catalog ID
43- 61 I19 --- GaiaDR2 Gaia DR2 Source ID
65- 72 F8.4 --- AT/Ag ?=-99.9 Absorption in T and g bands ratio
75- 82 F8.4 --- e_AT/Ag ?=-99.9 Error on AT/Ag value
88- 93 F6.3 mag Gmag Gaia DR2 G magnitude
99-103 F5.3 mag e_Gmag Error on Gaia DR2 G magnitude
109-114 F6.3 mag BPmag ?=0.0 Gaia DR2 GBP magnitude
120-124 F5.3 mag e_BPmag ?=0.0 Error on Gaia DR2 GBP magnitude
130-135 F6.3 mag RPmag ?=0.0 Gaia DR2 GRP magnitude
141-145 F5.3 mag e_RPmag ?=0.0 Error on Gaia DR2 GRP magnitude
151-156 F6.3 mag Tmag TESS T magnitude
162-166 F5.3 mag e_Tmag Error on TESS T magnitude
172-177 F6.3 mag Bmag ?=0.0 B Johnson magnitude
183-187 F5.3 mag e_Bmag ?=0.0 Error on B Johnson magnitude
193-198 F6.3 mag Vmag ?=0.0 V Johnson magnitude
204-208 F5.3 mag e_Vmag ?=0.0 Error on V Johnson magnitude
214-219 F6.3 mag Jmag ?=0.0 2MASS J magnitude
225-229 F5.3 mag e_Jmag ?=0.0 Error on 2MASS J magnitude
235-240 F6.3 mag Hmag ?=0.0 2MASS H magnitude
246-250 F5.3 mag e_Hmag ?=0.0 Error on 2MASS H magnitude
256-261 F6.3 mag Kmag ?=0.0 2MASS K magnitude
267-271 F5.3 mag e_Kmag ?=0.0 Error on 2MASS K magnitude
277-282 F6.3 mag W1mag ?=0.0 WISE W1 magnitude
288-292 F5.3 mag e_W1mag ?=0.0 Error on WISE W1 magnitude
298-303 F6.3 mag W2mag ?=0.0 WISE W2 magnitude
309-313 F5.3 mag e_W2mag ?=0.0 Error on WISE W2 magnitude
319-324 F6.3 mag W3mag ?=0.0 WISE W3 magnitude
330-334 F5.3 mag e_W3mag ?=0.0 Error on WISE W3 magnitude
340-345 F6.3 mag W4mag ?=0.0 WISE W4 magnitude
351-355 F5.3 mag e_W4mag Error on WISE W4 magnitude
359-364 F6.4 --- E(B-V) Reddening
369-374 F6.4 mas Plx Parallax from Gaia DR2
376-383 F8.4 mas/yr pmRA Proper motion along RA from Gaia DR2, pmRA*cosDE
385-392 F8.4 mas/yr pmDE Proper motion along Dec from Gaia DR2
410-413 A4 --- Assoc Name of the association that host the star (G1)
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Global notes:
Note (G1): association are ChI, ChII, CrA, Lup and Vel.
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Acknowledgements:
Domenico Nardiello, domenico.nardiello(at)lam.fr
References:
Nardiello et al., Paper I 2019MNRAS.490.3806N 2019MNRAS.490.3806N, Cat. J/MNRAS/490/3806
Nardiello et al., Paper II 2020MNRAS.495.4924N 2020MNRAS.495.4924N, Cat. J/MNRAS/495/4924
(End) Patricia Vannier [CDS] 23-Oct-2020