TESS Observations of Cepheid Stars: First Light Results

J 2021

TESS Observations of Cepheid Stars: First Light Results

PLACHY, Emese; András PÁL; Attila BÓDI; Pal SZABO; László MOLNÁR et. al.

Základní údaje

Originální název

TESS Observations of Cepheid Stars: First Light Results

Autoři

PLACHY, Emese; András PÁL; Attila BÓDI; Pal SZABO; László MOLNÁR; Laszlo SZABADOS; József BENKŐ; Richard I. ANDERSON; Earl P. BELLINGER; Anupam BHARDWAJ; M. EBADI; Kosmas GAZEAS; FJ HAMBSCH; Amir HASANZADEH; Monika I. JURKOVIC; M. J. KALAEE; Pierre KERVELLA; K. KOLENBERG; Przemysław MIKOLAJCZYK; Nicolas NARDETTO; J. M. NEMEC; H. NETZEL; Chow-Choong NGEOW; Dogus OZUYAR; Javier PASCUAL-GRANADO; Bogumił PILECKI; Vincenzo RIPEPI; Marek SKARKA; Radoslaw SMOLEC; Ádám SÓDOR; Robert SZABO; Jorgen CHRISTENSEN-DALSGAARD; Jon JENKINS; Hans KJELDSEN; George R. RICKER a Roland VANDERSPEK

Vydání

Astrophysical Journal, Supplement Series, BRISTOL, IOP PUBLISHING LTD, 2021, 0067-0049

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 9.200

Kód RIV

RIV/00216224:14310/21:00121294

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.3847/1538-4365/abd4e3

UT WoS

000621914900001

EID Scopus

2-s2.0-85102501736

Klíčová slova anglicky

Stellar pulsations; Cepheid variable stars; Stellar photometry

Štítky

14312040, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 23. 3. 2021 17:12, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

We present the first analysis of Cepheid stars observed by the TESS space mission in Sectors 1-5. Our sample consists of 25 pulsators: ten fundamental mode, three overtone and two double-mode classical Cepheids, plus three type II and seven anomalous Cepheids. The targets were chosen from fields with different stellar densities, both from the Galactic field and from the Magellanic System. Three targets have 2 minutes cadence light curves available by the TESS Science Processing Operations Center: for the rest, we prepared custom light curves from the full-frame images with our own differential photometric FITSH pipeline. Our main goal was to explore the potential and the limitations of TESS concerning the various subtypes of Cepheids. We detected many low-amplitude features: weak modulation, period jitter, and timing variations due to light-time effect. We also report signs of nonradial modes and the first discovery of such a mode in an anomalous Cepheid, the overtone star XZ Cet, which we then confirmed with ground-based multicolor photometric measurements. We prepared a custom photometric solution to minimize saturation effects in the bright fundamental-mode classical Cepheid, beta Dor with the lightkurve software, and we revealed strong evidence of cycle-to-cycle variations in the star. In several cases, however, fluctuations in the pulsation could not be distinguished from instrumental effects, such as contamination from nearby sources, which also varies between sectors. Finally, we discuss how precise light-curve shapes will be crucial not only for classification purposes but also to determine physical properties of these stars.

Návaznosti

EF16_027/0008360, projekt VaV

Název: Postdoc@MUNI

Citovat

@article{1754857,
   author = {Plachy, Emese and Pál, András and Bódi, Attila and Szabo, Pal and Molnár, László and Szabados, Laszlo and Benkő, József and Anderson, Richard I. and Bellinger, Earl P. and Bhardwaj, Anupam and Ebadi, M. and Gazeas, Kosmas and Hambsch, FJ and Hasanzadeh, Amir and Jurkovic, Monika I. and Kalaee, M. J. and Kervella, Pierre and Kolenberg, K. and Mikolajczyk, Przemysław and Nardetto, Nicolas and Nemec, J. M. and Netzel, H. and Ngeow, ChowandChoong and Ozuyar, Dogus and PascualandGranado, Javier and Pilecki, Bogumił and Ripepi, Vincenzo and Skarka, Marek and Smolec, Radoslaw and Sódor, Ádám and Szabo, Robert and ChristensenandDalsgaard, Jorgen and Jenkins, Jon and Kjeldsen, Hans and Ricker, George R. and Vanderspek, Roland},
   article_location = {BRISTOL},
   article_number = {1},
   doi = {https://doi.org/10.3847/1538-4365/abd4e3},
   keywords = {Stellar pulsations; Cepheid variable stars; Stellar photometry},
   language = {eng},
   issn = {0067-0049},
   journal = {Astrophysical Journal, Supplement Series},
   title = {TESS Observations of Cepheid Stars: First Light Results},
   url = {https://doi.org/10.3847/1538-4365/abd4e3},
   volume = {253},
   year = {2021}
}

TY  - JOUR
ID  - 1754857
AU  - Plachy, Emese - Pál, András - Bódi, Attila - Szabo, Pal - Molnár, László - Szabados, Laszlo - Benkő, József - Anderson, Richard I. - Bellinger, Earl P. - Bhardwaj, Anupam - Ebadi, M. - Gazeas, Kosmas - Hambsch, FJ - Hasanzadeh, Amir - Jurkovic, Monika I. - Kalaee, M. J. - Kervella, Pierre - Kolenberg, K. - Mikolajczyk, Przemysław - Nardetto, Nicolas - Nemec, J. M. - Netzel, H. - Ngeow, Chow-Choong - Ozuyar, Dogus - Pascual-Granado, Javier - Pilecki, Bogumił - Ripepi, Vincenzo - Skarka, Marek - Smolec, Radoslaw - Sódor, Ádám - Szabo, Robert - Christensen-Dalsgaard, Jorgen - Jenkins, Jon - Kjeldsen, Hans - Ricker, George R. - Vanderspek, Roland
PY  - 2021
TI  - TESS Observations of Cepheid Stars: First Light Results
JF  - Astrophysical Journal, Supplement Series
VL  - 253
IS  - 1
SP  - 1-24
EP  - 1-24
PB  - IOP PUBLISHING LTD
SN  - 00670049
KW  - Stellar pulsations
KW  - Cepheid variable stars
KW  - Stellar photometry
UR  - https://doi.org/10.3847/1538-4365/abd4e3
N2  - We present the first analysis of Cepheid stars observed by the TESS space mission in Sectors 1-5. Our sample consists of 25 pulsators: ten fundamental mode, three overtone and two double-mode classical Cepheids, plus three type II and seven anomalous Cepheids. The targets were chosen from fields with different stellar densities, both from the Galactic field and from the Magellanic System. Three targets have 2 minutes cadence light curves available by the TESS Science Processing Operations Center: for the rest, we prepared custom light curves from the full-frame images with our own differential photometric FITSH pipeline. Our main goal was to explore the potential and the limitations of TESS concerning the various subtypes of Cepheids. We detected many low-amplitude features: weak modulation, period jitter, and timing variations due to light-time effect. We also report signs of nonradial modes and the first discovery of such a mode in an anomalous Cepheid, the overtone star XZ Cet, which we then confirmed with ground-based multicolor photometric measurements. We prepared a custom photometric solution to minimize saturation effects in the bright fundamental-mode classical Cepheid, beta Dor with the lightkurve software, and we revealed strong evidence of cycle-to-cycle variations in the star. In several cases, however, fluctuations in the pulsation could not be distinguished from instrumental effects, such as contamination from nearby sources, which also varies between sectors. Finally, we discuss how precise light-curve shapes will be crucial not only for classification purposes but also to determine physical properties of these stars.
ER  -

PLACHY, Emese; András PÁL; Attila BÓDI; Pal SZABO; László MOLNÁR; Laszlo SZABADOS; József BENK$\backslash$H O; Richard I. ANDERSON; Earl P. BELLINGER; Anupam BHARDWAJ; M. EBADI; Kosmas GAZEAS; FJ HAMBSCH; Amir HASANZADEH; Monika I. JURKOVIC; M. J. KALAEE; Pierre KERVELLA; K. KOLENBERG; Przemysław MIKOLAJCZYK; Nicolas NARDETTO; J. M. NEMEC; H. NETZEL; Chow-Choong NGEOW; Dogus OZUYAR; Javier PASCUAL-GRANADO; Bogumił PILECKI; Vincenzo RIPEPI; Marek SKARKA; Radoslaw SMOLEC; Ádám SÓDOR; Robert SZABO; Jorgen CHRISTENSEN-DALSGAARD; Jon JENKINS; Hans KJELDSEN; George R. RICKER a Roland VANDERSPEK. TESS Observations of Cepheid Stars: First Light Results. \textit{Astrophysical Journal, Supplement Series}. BRISTOL: IOP PUBLISHING LTD, 2021, roč.~253, č.~1, s.~1-24. ISSN~0067-0049. Dostupné z: https://doi.org/10.3847/1538-4365/abd4e3.

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