YSOVAR: Mid-infrared Variability among YSOs in the Star Formation Region Serpens South

Scott J. Wolk, H. Moritz Günther, Katja Poppenhaeger, E. Winston, L. M. Rebull, J. R. Stauffer, R. A. Gutermuth, A. M. Cody, L. A. Hillenbrand, P. Plavchan, K. R. Covey, Inseok Song

Research output: Contribution to journalArticle

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Abstract

We present a time-variability study of young stellar objects (YSOs) in the Serpens South cluster performed at 3.6 and 4.5 μm with the Spitzer Space Telescope; this study is part of the Young Stellar Object VARiability project. We have collected light curves for more than 1500 sources, including 85 cluster members, over 38 days. This includes 44 class I sources, 19 sources with flat spectral energy distributions (SEDs), 17 class II sources, and five diskless YSO candidates. We find a high variability fraction among embedded cluster members of ∼70%, whereas young stars without a detectable disk display no variability. We detect periodic variability for 32 sources with periods primarily in the range of 0.2–14 days and a subset of fast rotators thought to be field binaries. The timescale for brightness changes are shortest for stars with the most photospheric SEDs and longest for those with flat or rising SEDs. While most variable YSOs become redder when fainter, as would be expected from variable extinction, about 10% get bluer as they get fainter. One source, SSTYSV J183006.13‑020108.0, exhibits “cyclical” color changes.
Original languageEnglish
Article number99
Number of pages20
JournalAstronomical Journal
Volume155
Issue number2
DOIs
Publication statusPublished - 01 Feb 2018
Externally publishedYes

Fingerprint

star formation
spectral energy distribution
energy
light curve
set theory
brightness
extinction
young
telescopes
timescale
color
stars
distribution

Keywords

  • accretion
  • accretion disks
  • infrared: stars
  • stars: formation
  • stars: pre-main sequence
  • stars: protostars

Cite this

Wolk, S. J., Günther, H. M., Poppenhaeger, K., Winston, E., Rebull, L. M., Stauffer, J. R., ... Song, I. (2018). YSOVAR: Mid-infrared Variability among YSOs in the Star Formation Region Serpens South. Astronomical Journal, 155(2), [99]. https://doi.org/10.3847/1538-3881/aaa6c4
Wolk, Scott J. ; Günther, H. Moritz ; Poppenhaeger, Katja ; Winston, E. ; Rebull, L. M. ; Stauffer, J. R. ; Gutermuth, R. A. ; Cody, A. M. ; Hillenbrand, L. A. ; Plavchan, P. ; Covey, K. R. ; Song, Inseok. / YSOVAR: Mid-infrared Variability among YSOs in the Star Formation Region Serpens South. In: Astronomical Journal. 2018 ; Vol. 155, No. 2.
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Wolk, SJ, Günther, HM, Poppenhaeger, K, Winston, E, Rebull, LM, Stauffer, JR, Gutermuth, RA, Cody, AM, Hillenbrand, LA, Plavchan, P, Covey, KR & Song, I 2018, 'YSOVAR: Mid-infrared Variability among YSOs in the Star Formation Region Serpens South', Astronomical Journal, vol. 155, no. 2, 99. https://doi.org/10.3847/1538-3881/aaa6c4

YSOVAR: Mid-infrared Variability among YSOs in the Star Formation Region Serpens South. / Wolk, Scott J.; Günther, H. Moritz; Poppenhaeger, Katja; Winston, E.; Rebull, L. M.; Stauffer, J. R.; Gutermuth, R. A.; Cody, A. M.; Hillenbrand, L. A.; Plavchan, P.; Covey, K. R.; Song, Inseok.

In: Astronomical Journal, Vol. 155, No. 2, 99, 01.02.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - YSOVAR: Mid-infrared Variability among YSOs in the Star Formation Region Serpens South

AU - Wolk, Scott J.

AU - Günther, H. Moritz

AU - Poppenhaeger, Katja

AU - Winston, E.

AU - Rebull, L. M.

AU - Stauffer, J. R.

AU - Gutermuth, R. A.

AU - Cody, A. M.

AU - Hillenbrand, L. A.

AU - Plavchan, P.

AU - Covey, K. R.

AU - Song, Inseok

PY - 2018/2/1

Y1 - 2018/2/1

N2 - We present a time-variability study of young stellar objects (YSOs) in the Serpens South cluster performed at 3.6 and 4.5 μm with the Spitzer Space Telescope; this study is part of the Young Stellar Object VARiability project. We have collected light curves for more than 1500 sources, including 85 cluster members, over 38 days. This includes 44 class I sources, 19 sources with flat spectral energy distributions (SEDs), 17 class II sources, and five diskless YSO candidates. We find a high variability fraction among embedded cluster members of ∼70%, whereas young stars without a detectable disk display no variability. We detect periodic variability for 32 sources with periods primarily in the range of 0.2–14 days and a subset of fast rotators thought to be field binaries. The timescale for brightness changes are shortest for stars with the most photospheric SEDs and longest for those with flat or rising SEDs. While most variable YSOs become redder when fainter, as would be expected from variable extinction, about 10% get bluer as they get fainter. One source, SSTYSV J183006.13‑020108.0, exhibits “cyclical” color changes.

AB - We present a time-variability study of young stellar objects (YSOs) in the Serpens South cluster performed at 3.6 and 4.5 μm with the Spitzer Space Telescope; this study is part of the Young Stellar Object VARiability project. We have collected light curves for more than 1500 sources, including 85 cluster members, over 38 days. This includes 44 class I sources, 19 sources with flat spectral energy distributions (SEDs), 17 class II sources, and five diskless YSO candidates. We find a high variability fraction among embedded cluster members of ∼70%, whereas young stars without a detectable disk display no variability. We detect periodic variability for 32 sources with periods primarily in the range of 0.2–14 days and a subset of fast rotators thought to be field binaries. The timescale for brightness changes are shortest for stars with the most photospheric SEDs and longest for those with flat or rising SEDs. While most variable YSOs become redder when fainter, as would be expected from variable extinction, about 10% get bluer as they get fainter. One source, SSTYSV J183006.13‑020108.0, exhibits “cyclical” color changes.

KW - accretion

KW - accretion disks

KW - infrared: stars

KW - stars: formation

KW - stars: pre-main sequence

KW - stars: protostars

U2 - 10.3847/1538-3881/aaa6c4

DO - 10.3847/1538-3881/aaa6c4

M3 - Article

VL - 155

JO - Astronomical Journal

JF - Astronomical Journal

SN - 0004-6256

IS - 2

M1 - 99

ER -

Wolk SJ, Günther HM, Poppenhaeger K, Winston E, Rebull LM, Stauffer JR et al. YSOVAR: Mid-infrared Variability among YSOs in the Star Formation Region Serpens South. Astronomical Journal. 2018 Feb 1;155(2). 99. https://doi.org/10.3847/1538-3881/aaa6c4