Actions
  • shareshare
  • link
  • cite
  • add
add
auto_awesome_motion View all 15 versions
Publication . Article . Preprint . 2021

Direct characterization of young giant exoplanets at high spectral resolution by coupling SPHERE and CRIRES+

Gilles Otten; Arthur Vigan; Eduard Muslimov; Mamadou N'Diaye; Elodie Choquet; Ulf Seemann; Kjetil Dohlen; +15 Authors
Open Access
Published: 01 Feb 2021 Journal: Astronomy & Astrophysics, volume 646, page A150 (issn: 0004-6361, eissn: 1432-0746, Copyright policy )
Publisher: EDP Sciences
Abstract
Studies of atmospheres of directly imaged exoplanets with high-resolution spectrographs have shown that their characterization is predominantly limited by noise on the stellar halo at the location of the studied exoplanet. An instrumental combination of high-contrast imaging and high spectral resolution that suppresses this noise and resolves the spectral lines can therefore yield higher quality spectra. We study the performance of the proposed HiRISE fiber coupling between the SPHERE and CRIRES+ at the VLT for spectral characterization of directly imaged planets. Using end-to-end simulations of HiRISE we determine the S/N of the detection of molecular species for known exoplanets in $H$ and $K$ bands, and compare them to CRIRES+. We investigate the ultimate detection limits of HiRISE as a function of stellar magnitude, and we quantify the impact of different coronagraphs and of the system transmission. We find that HiRISE largely outperforms CRIRES+ for companions around bright hosts like $��$ Pic or 51 Eri. For an $H=3.5$ host, we observe a gain of a factor of up to 16 in observing time with HiRISE to reach the same S/N on a companion at 200 mas. More generally, HiRISE provides better performance than CRIRES+ in two-hour integration times between 50-350 mas for hosts with $H<8.5$ and between 50-700 mas for $H<7$. For fainter hosts like PDS 70 and HIP 65426, no significant improvements are observed. We find that using no coronagraph yields the best S/N when characterizing known exoplanets due to higher transmission and fiber-based starlight suppression. We demonstrate that the overall transmission of the system is in fact the main driver of performance. Finally, we show that HiRISE outperforms the best detection limits of SPHERE for bright stars, opening major possibilities for the characterization of future planetary companions detected by other techniques.
21 pages, 17 figures. 2 tables. Originally accepted for publication in A&A. Revised version after error in sky background was discovered (too high) and corrected in proofing stage. Revisions made in Abstract, Sections 3-6 and Figures 6-12,C1,C2 that address the changes in performance. Resubmitted to A&A
Subjects by Vocabulary

Microsoft Academic Graph classification: Physics Apparent magnitude Stars Very Large Telescope Coronagraph law.invention law Planet Exoplanet Astrophysics Spectral resolution Spectrograph

arXiv: Astrophysics::Earth and Planetary Astrophysics Astrophysics::Solar and Stellar Astrophysics Astrophysics::Galaxy Astrophysics

Subjects

Space and Planetary Science, Astronomy and Astrophysics, [SDU]Sciences of the Universe [physics], [PHYS]Physics [physics], instrumentation: spectrographs, instrumentation: high angular resolution, infrared: planetary systems, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Instrumentation and Methods for Astrophysics (astro-ph.IM), Earth and Planetary Astrophysics (astro-ph.EP), FOS: Physical sciences, 520 Astronomy, 530 Physics, 620 Engineering, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Earth and Planetary Astrophysics

Funded by
EC| OPTICON
Project
OPTICON
Optical Infrared Co-ordination Network for Astronomy
  • Funder: European Commission (EC)
  • Project Code: 312430
  • Funding stream: FP7 | SP4 | INFRA
,
EC| OPTICON
Project
OPTICON
Optical Infrared Coordination Network for Astronomy
  • Funder: European Commission (EC)
  • Project Code: 226604
  • Funding stream: FP7 | SP4 | INFRA
,
EC| HiRISE
Project
HiRISE
High-Resolution Imaging and Spectroscopy of Exoplanets
  • Funder: European Commission (EC)
  • Project Code: 757561
  • Funding stream: H2020 | ERC | ERC-STG
Validated by funder
,
EC| ICARUS
Project
ICARUS
Towards Innovative cost-effective astronomical instrumentation
  • Funder: European Commission (EC)
  • Project Code: 678777
  • Funding stream: H2020 | ERC | ERC-STG
Related to Research communities
NEANIAS Space Research Community
moresidebar