Occultation by a protoplanetary clump in the young abrupt variable GM Cepheid

W. P. Chen, S. C.L. Hu, B. H. Su, C. D. Lee, C. C. Lin, C. K. Huang, P. F. Wang, P. S. Chiang, C. H. Lee, S. Sato

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

GM Cephei (GM Cep) is an active T Tauri star in the young (∼ 4 Myr) open cluster Trumpler 37, showing abrupt UX Orionis type of photometric variability. Chen et al. (2012) reported frequent, sporadic brightening events, each of < 0.5 mag and lasting for days, which must have been originated from circumstellar accretion. In addition, the star also showed a brightness drop of ∼ 1 mag lasting continuously for about a month, during which time the star became bluer when fainter. Moreover, the brightness drops seem to have a recurrence timescale of a year. It is proposed that the drop is the consequence of obscuration of the central star by an orbiting dust concentration, exemplifying disk inhomogeneity in transition between grain coagulation and planetesimal formation in a young circumstellar disk. The star was found to exhibit a few percent polarization in the optical wavelengths, and an enhanced level of polarization during the occultation.

Original languageEnglish
Title of host publicationFirst International Conference on Chemical Evolution of Star Forming Region and Origin of Life, Astrochem 2012
Pages178-182
Number of pages5
DOIs
StatePublished - 2013
Event1st International Conference on Chemical Evolution of Star Forming Region and Origin of Life, Astrochem 2012 - Kolkata, India
Duration: 10 Jul 201213 Jul 2012

Publication series

NameAIP Conference Proceedings
Volume1543
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference1st International Conference on Chemical Evolution of Star Forming Region and Origin of Life, Astrochem 2012
Country/TerritoryIndia
CityKolkata
Period10/07/1213/07/12

Keywords

  • Herbig Ae/Be
  • Occultations
  • Planets and satellites: formation
  • Protoplanetary disks
  • Stars: individual (GM Cephei)
  • Stars: pre-main sequence
  • Stars: variables: T Tauri

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