A5055648286- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Thermography and Photoacoustic Techniques
- Advanced Chemical Physics Studies
- Optical Systems and Laser Technology
- Advanced Measurement and Detection Methods
- Laser Material Processing Techniques
- Atmospheric Ozone and Climate
- Optical Coatings and Gratings
- Photonic and Optical Devices
The University of Texas at Austin
2022-2024
Abstract The Immersion GRating INfrared Spectrometer (IGRINS) is a compact, high-resolution ( R ∼ 45,000) near-infrared spectrograph spanning 1.45–2.45 μ m in single exposure. We introduce the Raw and Reduced IGRINS Spectral Archive (RRISA), which provides public data access for all non-proprietary taken at McDonald Observatory's Harlan J. Smith Telescope, Lowell Discovery Telescope (formerly Channel Telescope), Gemini South. RRISA to raw files, reduced products, cross-matched targets with...
We used the Immersion GRating Infrared Spectrometer (IGRINS) to determine fundamental parameters for 61 K- and M-type young stellar objects (YSOs) located in Ophiuchus Upper Scorpius star-forming regions. employed synthetic spectra a Markov chain Monte Carlo approach fit specific K-band spectral regions photospheric temperature ($T_{\rm eff}$), surface gravity ($\log$ g), magnetic field strength (B), projected rotational velocity ($v \sin i$), veiling ($r_{\rm K}$). determined B $\sim$46% of...
Modern astronomical échelle spectrographs produce information-rich 2D echellograms that undergo standard reduction procedures to extracted 1D spectra.The final postprocessing steps of these spectra are often left the end-user scientists, since order operations and algorithm choice may depend on scientific application.Implementing post-processing from scratch acts as a barrier entry newcomers, taxes innovation, erodes reproducibility.Here we assemble streamline collection spectroscopic data...
Stellar spin down is a critical yet poorly understood component of stellar evolution. In particular, results from the Kepler Mission imply that mature age, solar-type stars have inefficient magnetic braking, resulting in stalled rate. However, large number precise asteroseismic ages are needed for ($\geq$ 3Gyr) order to probe regime where traditional and spin-down models differ. this paper, we present new benchmark star gyrochronology discovered using reprocessed short cadence data. KIC...
Abstract Stellar spin down is a critical yet poorly understood component of stellar evolution. In particular, results from the Kepler Mission imply that mature age, solar-type stars have inefficient magnetic braking, resulting in stalled spin-down rate. However, large number precise asteroseismic ages are needed for (≥3 Gyr) order to probe regime where traditional and models differ. this paper, we present new benchmark star gyrochronology discovered using reprocessed short cadence data. KIC...
The chemical abundance measurements of host stars and their substellar companions provide a powerful tool to trace the formation mechanism planetary systems. We present detailed high-resolution spectroscopic analysis young M-type star, DH Tau A, which is located in Taurus molecular cloud belonging Taurus-Auriga star-forming region. This star low-mass companion, b, both companion are still accreting phase. apply our technique (Hejazi et al. 2024) measure abundances carbon oxygen using carbon-...
Abstract The chemical abundance measurements of host stars and their substellar companions provide a powerful tool to trace the formation mechanism planetary systems. We present detailed high-resolution spectroscopic analysis young M-type star, DH Tau A, which is located in Taurus molecular cloud belonging Taurus-Auriga star-forming region. This star low-mass companion, b, both companion are still accreting phase. apply our technique measure abundances carbon oxygen using carbon-...
This conference presentation was prepared for the Advances in Optical and Mechanical Technologies Telescopes Instrumentation V at SPIE Astronomical + Instrumentation, 2022.
We used the Immersion GRating Infrared Spectrometer (IGRINS) to determine fundamental parameters for 61 K- and M-type young stellar objects (YSOs) located in Ophiuchus Upper Scorpius star-forming regions. employed synthetic spectra a Markov chain Monte Carlo approach fit specific K-band spectral regions photospheric temperature ($T_{\rm eff}$), surface gravity ($\log$ g), magnetic field strength (B), projected rotational velocity ($v \sin i$), veiling ($r_{\rm K}$). determined B $\sim$46% of...