The Post-Outburst Spectrum of L1415-IRS
Abstract
We present near-infrared spectroscopic observations of L1415-IRS, a Class I type young stellar object that underwent a factor of >30 photometric outburst in the early 2000s. Ours is the first reported spectroscopy of this deeply embedded source. Both components of L1415-IRS present continuum plus H2 emission. The southern component has additional weak HI Brγ and CO emission. Based upon our spectrum and evidence of a declining lightcurve, we hypothesize that either: the outburst was not large enough and therefore hot enough to produce the FU Ori type absorption spectrum commonly interpreted as an accretion disk atmosphere, or the source has already recovered from FU Ori-type equatorial accretion to re-establish T Tauri-type magnetospheric accretion.
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BibTeX
@misc{hillenbrand2026postoutburst,
title = {{The Post-Outburst Spectrum of L1415-IRS}},
author = {Lynne A. Hillenbrand and Thomas P. Greene and Evan R. Portnoi and Bringfried Stecklum},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.16324},
eprint = {2609.16324},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.16324},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - The Post-Outburst Spectrum of L1415-IRS
AU - Lynne A. Hillenbrand
AU - Thomas P. Greene
AU - Evan R. Portnoi
AU - Bringfried Stecklum
PY - 2026
DA - 2026/09/14
PB - arXiv
DO - 10.48550/arxiv.2609.16324
UR - https://arxiv.org/abs/2609.16324
AB - We present near-infrared spectroscopic observations of L1415-IRS, a Class I type young stellar object that underwent a factor of >30 photometric outburst in the early 2000s. Ours is the first reported spectroscopy of this deeply embedded source. Both components of L1415-IRS present continuum plus H_2 emission. The southern component has additional weak HI Brγ and CO emission. Based upon our spectrum and evidence of a declining lightcurve, we hypothesize that either: the outburst was not large enough and therefore hot enough to produce the FU Ori type absorption spectrum commonly interpreted as an accretion disk atmosphere, or the source has already recovered from FU Ori-type equatorial accretion to re-establish T Tauri-type magnetospheric accretion.
ER -