Spectral Typing of Late Type Stellar Companions to Young Stars from Low Dispersion Near-Infrared Integral Field Unit Data

TL;DR

This study utilizes low-resolution near-infrared spectra from Project 1640 to classify late-type stellar companions, determine their physical properties, and validate the spectral analysis methods for young star systems.

Contribution

It demonstrates the effectiveness of low-resolution near-infrared spectra in spectral typing and characterizing late-type companions to young stars, validating the data reduction and analysis techniques.

Findings

Successful spectral classification of late-type companions

Determination of effective temperature and surface gravity

Validation of spectral analysis methods for low-resolution data

Abstract

We used the Project 1640 near-infrared coronagraph and integral field spectrograph to observe 19 young solar type stars. Five of these stars are known binary stars and we detected the late-type secondaries and were able to measure their JH spectra with a resolution of R\sim30. The reduced, extracted, and calibrated spectra were compared to template spectra from the IRTF spectral library. With this comparison we test the accuracy and consistency of spectral type determination with the low-resolution near-infrared spectra from P1640. Additionally, we determine effective temperature and surface gravity of the companions by fitting synthetic spectra calculated with the PHOENIX model atmosphere code. We also present several new epochs of astrometry of each of the systems. Together these data increase our knowledge and understanding of the stellar make up of these systems. In addition to the astronomical results, the analysis presented helps validate the Project 1640 data reduction and spectral extraction processes and the utility of low-resolution, near-infrared spectra for characterizing late-type companions in multiple systems.