Precision radial velocity measurements by the forward-modeling technique in the near-infrared†
| العنوان: | Precision radial velocity measurements by the forward-modeling technique in the near-infrared† |
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| المؤلفون: | Hiroki Harakawa, Takuma Serizawa, Klaus W. Hodapp, Teruyuki Hirano, Motohide Tamura, Jun Nishikawa, Akitoshi Ueda, Masayuki Kuzuhara, Takashi Kurokawa, Mihoko Konishi, Takayuki Kotani, Eric Gaidos, Tomoyuki Kudo, Sébastien Vievard, Masato Ishizuka, Masashi Omiya, Shane Jacobson, Bun'ei Sato |
| المصدر: | Publications of the Astronomical Society of Japan. 72 |
| بيانات النشر: | Oxford University Press (OUP), 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Spectral line, symbols.namesake, Astrophysics::Solar and Stellar Astrophysics, Emission spectrum, Instrumentation and Methods for Astrophysics (astro-ph.IM), Spectrograph, Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics::Galaxy Astrophysics, Earth and Planetary Astrophysics (astro-ph.EP), Physics, Near-infrared spectroscopy, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy and Astrophysics, Radial velocity, Wavelength, Stars, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, symbols, Astrophysics::Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics, Doppler effect, Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | Precision radial velocity (RV) measurements in the near-infrared are a powerful tool to detect and characterize exoplanets around low-mass stars or young stars with higher magnetic activity. However, the presence of strong telluric absorption lines and emission lines in the near infrared that significantly vary in time can prevent extraction of RV information from these spectra by classical techniques, which ignore or mask the telluric lines. We present a methodology and pipeline to derive precision RVs from near-infrared spectra using a forward-modeling technique. We applied this to spectra with a wide wavelength coverage (Y, J, and H bands, simultaneously), taken by the InfraRed Doppler (IRD) spectrograph on the Subaru 8.2-m telescope. Our pipeline extracts the instantaneous instrumental profile of the spectrograph for each spectral segment, based on a reference spectrum of the laser-frequency comb that is injected into the spectrograph simultaneously with the stellar light. These profiles are used to derive the intrinsic stellar template spectrum, which is free from instrumental broadening and telluric features, as well as model and fit individual observed spectra in the RV analysis. Implementing a series of numerical simulations using theoretical spectra that mimic IRD data, we test the pipeline and show that IRD can achieve $ 100$ per pixel at 1000 nm. Dependences of RV precision on various stellar parameters (e.g., $T_{\rm eff}$, $v\sin i$, [Fe/H]) and the impact of telluric-line blendings on the RV accuracy are discussed through the mock spectra analyses. We also apply the RV-analysis pipeline to the observed spectra of GJ 699 and TRAPPIST-1, demonstrating that the spectrograph and the pipeline are capable of an RV accuracy of $ 21 pages, 20 figures; accepted for publication in PASJ; typos corrected |
| تدمد: | 2053-051X 0004-6264 |
| DOI: | 10.1093/pasj/psaa085 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::50a51ef4e1540e98874e2a2b12de68be https://doi.org/10.1093/pasj/psaa085 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....50a51ef4e1540e98874e2a2b12de68be |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 2053051X 00046264 |
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| DOI: | 10.1093/pasj/psaa085 |