Constraining orbits and masses of stellar companions with SCExAO imaging and REACH spectroscopy

Ananya Sahoo; Julien Lozi; Sebastien Vievard; Olivier Guyon; Takayuki Kotani; Hajime Kawahara; Nemanja Jovanovic; Vincent Deo; Masato Ishizuka

doi:10.1117/12.2563133

13 December 2020 Constraining orbits and masses of stellar companions with SCExAO imaging and REACH spectroscopy

Ananya Sahoo, Julien Lozi, Sebastien Vievard, Olivier Guyon, Takayuki Kotani, Hajime Kawahara, Nemanja Jovanovic, Vincent Deo, Masato Ishizuka

Author Affiliations +

Proceedings Volume 11448, Adaptive Optics Systems VII; 1144809 (2020) https://doi.org/10.1117/12.2563133
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

Orbital parameters of stellar companions can be constrained by multi-epoch observations where the astrometric position relative to the host star is measured. Additionally, radial velocity (RV) measurements of the host star may constrain the companion mass. We describe two major advances for high contrast imaging systems that significantly improve estimation of orbital parameters and masses. First, well-calibrated fiducial satellite speckles are inserted in the science images by way of deformable mirror (DM) modulation to improve astrometric measurement accuracy. Second, radial velocity measurement of the companion light reveals its velocity along the line-of-sight. We describe how the two techniques, together, can efficiently constrain orbital parameters and masses, and can do so over a shorter observation time baseline than previously possible. We demonstrate our technique with the REACH (Rigorous Exoplanetary Atmosphere Characterization with High dispersion coronagraphy) instrument at the Subaru Telescope. REACH takes extreme adaptive optics corrected light via single mode fiber from the SCExAO instrument and injects it to the high-resolution (R<70000) infrared spectrograph IRD instrument. With this technique we can achieve an astrometric precision of 1.7 mas and simultaneously measure radial velocity to a precision of <2 m/s. This high precision technique can also be extended to determine the orbits and characterize young massive planets around M-type stars.

Conference Presentation

Citation Download Citation

Ananya Sahoo, Julien Lozi, Sebastien Vievard, Olivier Guyon, Takayuki Kotani, Hajime Kawahara, Nemanja Jovanovic, Vincent Deo, and Masato Ishizuka "Constraining orbits and masses of stellar companions with SCExAO imaging and REACH spectroscopy", Proc. SPIE 11448, Adaptive Optics Systems VII, 1144809 (13 December 2020); https://doi.org/10.1117/12.2563133

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available