ES-07-0016

Application of data reduction/analysis software of IRD to known planet hosts and M dwarfs

Masayuki Kuzuhara, Teruyuki Hirano, Takayuki Kotani, Bun'ei Sato, Motohide Tamura, Masashi Omiya, Takuya Takarada, Yui Kasagi, Hiroki Harakawa, Taichi Uyama, Tomoyuki Kudo, Takashi Kurokawa, Takuma Serizawa, Jun Nishikawa, Klaus Hodapp, Shane Jacobson, Sebastien Vievard, Akitoshi Ueda, IRD Instrument team, IRD SSP team

The InfraRed Doppler (IRD) instrument is a high-resolution (R ~ 70,000) spectrograph of the Subaru Telescope that adopts fibers for light injections and leaser frequency comb (LFC) for wavelength calibrations. Object lights corrected by adaptive optics (AO) are injected into the fibers and the AO corrected images are available to constrain the presence of a stellar companion around a target. We have developed the data reduction software programs to extract calibrated spectra from raw H2RG data and create distortion-corrected images from the raw AO images. The programs automatically identify the type (object, flat-fielding, dark, or comparison) of raw data from direct data inspections, helping the preparations before starting data reductions. The raw data are first processed by removing bias and correlated read noise. Next, a spectrum extraction solution is made from flat-fielding data and applied to both flat-fielding and object data taking care of fringe influences. The automatic wavelength calibrations are performed with Th-Ar data. The extracted 1D spectra are again wavelength-calibrated with LFC spectra and processed with the forward-modeling pipeline for radial velocity (RV) measurements (Hirano et al. 2020). We have applied the data reductions processes to the spectrum data and AO images of targets observed in our IRD projects. This poster describes the data reduction software programs and presents some results obtained with the programs. The results include the RV measurements for planet hosts such as GJ 436 and detection of stellar companions around M dwarfs observed in the Subaru Strategic Program (SSP) of IRD (IRD-SSP).