A new treatment of telluric and stellar features for medium-resolution spectroscopy and molecular mapping - Application to the abundance determination on β Pic b

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Volume 685 (May 2024)

A&A, 685 (2024) A120

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Table 1

Comparing results of the different star spectrum subtraction schemes on the normalised CCF of the residual map with a 1700 K, log g=4.0, [Fe/H]=0.0 Exo-REM model, detailing the CO and H₂O individual contributions.

Method	CCF strength			Radial velocity		Planet PSF
	Peak	noise	S/N	v_r	σ_broad	X_c ^(†)	Y_c ^(†)	σ _PSF
	height	level		(km s⁻¹)	(km s⁻¹)	(mas)	(mas)	(pixel)
Full-model: 1700 K, log g=4.0, [Fe/H]=0.0, R_spec=6000
H18	0.8952 ± 0.0076	0.0511	17.52 ± 0.15	1.03 ± 0.35	46.80 ± 0.38	218.0 ± 0.25	−277.13 ± 0.25	2.34 ± 0.01
STAREM	0.8452 ± 0.0060	0.0431	19.60 ± 0.14	−0.25 ± 0.25	41.87 ± 0.30	216.63 ± 0.25	−276.75 ± 0.25	2.71 ± 0.01

Only CO
H18	0.4837 ± 0.0049	0.0432	11.20 ± 0.11	−4.29 ± 0.41	45.91 ± 0.49	215.38 ± 0.25	−274.25 ± 0.25	2.47 ± 0.02
STAREM	0.5094 ± 0.0048	0.0431	11.81 ± 0.11	−3.24 ± 0.35	41.85 ± 0.42	214.00 ± 0.25	−273.50 ± 0.25	2.66 ± 0.02

Only H₂O
H18	0.7887 ± 0.0076	0.0523	15.07 ± 0.15	2.28 ± 0.38	41.64 ± 0.33	218.62 ± 0.25	−278.63 ± 0.25	2.28 ± 0.02
STAREM	0.6947 ± 0.0056	0.0451	15.41 ± 0.12	0.76 ± 0.29	41.64 ± 0.33	217.13 ± 0.25	−279.00 ± 0.25	2.75 ± 0.02

Notes. We also tried the molecular mapping on CH₄, NH₃, FeH, and CO₂, none leading to a significant detection within the area around planet spaxels. ^(†)The star is located at coords (X_⋆, Y_⋆)=(0,0) mas.

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