34 research outputs found
pyTANSPEC: A Data Reduction Package for TANSPEC
The TIFR-ARIES Near Infrared Spectrometer (TANSPEC) instrument provides
simultaneous wavelength coverage from 0.55 to 2.5 micron, mounted on India's
largest ground-based telescope, 3.6-m Devasthal Optical Telescope at Nainital,
India. The TANSPEC offers three modes of observations, imaging with various
filters, spectroscopy in the low-resolution prism mode with derived R~ 100-400
and the high-resolution cross-dispersed mode (XD-mode) with derived median R~
2750 for a slit of width 0.5 arcsec. In the XD-mode, ten cross-dispersed orders
are packed in the 2048 x 2048 pixels detector to cover the full wavelength
regime. As the XD-mode is most utilized as well as for consistent data
reduction for all orders and to reduce data reduction time, a dedicated
pipeline is at the need. In this paper, we present the code for the TANSPEC
XD-mode data reduction, its workflow, input/output files, and a showcase of its
implementation on a particular dataset. This publicly available pipeline
pyTANSPEC is fully developed in Python and includes nominal human intervention
only for the quality assurance of the reduced data. Two customized
configuration files are used to guide the data reduction. The pipeline creates
a log file for all the fits files in a given data directory from its header,
identifies correct frames (science, continuum and calibration lamps) based on
the user input, and offers an option to the user for eyeballing and
accepting/removing of the frames, does the cleaning of raw science frames and
yields final wavelength calibrated spectra of all orders simultaneously.Comment: 10 pages, 6 figures, accepted for publication in the Special Issue of
Journal of Astrophysics & Astronomy, 2022, Star formation studies in context
of NIR instruments on 3.6m DOT, held at ARIES, Nainital during 4-7, May, 202
Quiescence of an Outburst of a Low-Mass Young Stellar Object: LDN1415-IRS
LDN1415-IRS, a low-mass young stellar object (YSO) went into an outburst
between 2001 and 2006, illuminating a surrounding nebula, LDN1415-Neb.
LDN1415-Neb was found to have brightened by I=3.77 mag by April 2006. The
optical light curve covering 15.5 years, starting from October 2006 to
January 2022, is presented in this study. The initial optical spectrum
indicated the presence of winds in the system but the subsequent spectra have
no wind indicators. The declining light curve and the absence of the P-Cygni
profile in later epoch spectra indicate that the star and nebula system is
retrieving back from its outburst state. Two Herbig-Haro objects (HHOs) are
positioned linearly with respect to the optical brightness peak of the nebula,
probably indicating the circumstellar disk being viewed edge-on. Our recent
deep near-infrared (NIR) imaging using TANSPEC has revealed the presence of a
nearby star-like source, south of the LDN1415-IRS, at an angular distance of
5.4 arcsec.Comment: Accepted for publication in the Journal of Astrophysics and Astronom