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

Sahoo, Ananya and Lozi, Julien and Vievard, Sebastien and Guyon, Olivier and Kotani, Takayuki and Kawahara, Hajime and Jovanovic, Nemanja and Deo, Vincent and Ishizuka, Masato (2020) Constraining orbits and masses of stellar companions with SCExAO imaging and REACH spectroscopy. In: Adaptive Optics Systems VII. Proceedings of SPIE. No.11448. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 1144809. ISBN 9781510636835.

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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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Sahoo, Ananya0000-0003-2806-1254
Lozi, Julien0000-0002-3047-1845
Vievard, Sebastien0000-0003-4018-2569
Guyon, Olivier0000-0002-1097-9908
Kawahara, Hajime0000-0003-3309-9134
Jovanovic, Nemanja0000-0001-5213-6207
Additional Information:© 2020 SPIE.
Series Name:Proceedings of SPIE
Issue or Number:11448
Record Number:CaltechAUTHORS:20201216-152240296
Persistent URL:
Official 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);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107138
Deposited By: George Porter
Deposited On:17 Dec 2020 15:11
Last Modified:16 Nov 2021 19:00

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