Evidence for an FU Orionis-like Outburst from a Classical T Tauri Star

Details Evidence for an FU Orionis-like Outburst from a Classical T Tauri Star Evidence for an FU Orionis-like Outburst from a Classical T Tauri Star

2010-11-09

arxiv.org/abs/1011.2063v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

14 pages, 11 figures, ApJ accepted

Scientific paper

We present pre- and post-outburst observations of the new FU Orionis-like young stellar object PTF 10qpf (also known as LkHa 188-G4 and HBC 722). Prior to this outburst, LkHa 188-G4 was classified as a classical T Tauri star on the basis of its optical emission-line spectrum superposed on a K8-type photosphere, and its photometric variability. The mid-infrared spectral index of LkHa 188-G4 indicates a Class II-type object. LkHa 188-G4 exhibited a steady rise by ~1 mag over ~11 months starting in Aug. 2009, before a subsequent more abrupt rise of > 3 mag on a time scale of ~2 months. Observations taken during the eruption exhibit the defining characteristics of FU Orionis variables: (i) an increase in brightness by > 4 mag, (ii) a bright optical/near-infrared reflection nebula appeared, (iii) optical spectra are consistent with a G supergiant and dominated by absorption lines, the only exception being Halpha which is characterized by a P Cygni profile, (iv) near-infrared spectra resemble those of late K--M giants/supergiants with enhanced absorption seen in the molecular bands of CO and H_2O, and (v) outflow signatures in H and He are seen in the form of blueshifted absorption profiles. LkHa 188-G4 is the first member of the FU Orionis-like class with a well-sampled optical to mid-infrared spectral energy distribution in the pre-outburst phase. The association of the PTF 10qpf outburst with the previously identified classical T Tauri star LkHa 188-G4 (HBC 722) provides strong evidence that FU Orionis-like eruptions represent periods of enhanced disk accretion and outflow, likely triggered by instabilities in the disk. The early identification of PTF 10qpf as an FU Orionis-like variable will enable detailed photometric and spectroscopic observations during its post-outburst evolution for comparison with other known outbursting objects.

Affiliated with

Also associated with

No associations

Rating

Evidence for an FU Orionis-like Outburst from a Classical T Tauri Star does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Evidence for an FU Orionis-like Outburst from a Classical T Tauri Star, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evidence for an FU Orionis-like Outburst from a Classical T Tauri Star will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-493428