Four-of-a-kind? Comprehensive atmospheric characterisation of the HR 8799 planets with VLTI/GRAVITY

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Volume 687 (July 2024)

A&A, 687 (2024) A298

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Table 10

Quench pressures, vertical mixing parameters, and sedimentation fractions for the HR 8799 planets.

Planet	log P_q (bar)	K_{zz q} (cm² s⁻¹)	K_{zz, AM01} (cm² s⁻¹)	f_sed MgSiO₃	Fe
b	${1.7}_{- 0.2}^{+ 0.2}$ $\[1.7_{-0.2}^{+0.2}\]$	${2.9}_{- 0.7}^{+ 0.6}$ $\[2.9_{-0.7}^{+0.6}\]$	${8.6}_{- 1.0}^{+ 0.8}$ $\[8.6_{-1.0}^{+0.8}\]$	${1.1}_{- 0.3}^{+ 0.3}$ $\[1.1_{-0.3}^{+0.3}\]$	$4_{- 1}^{+ 2}$ $\[4_{-1}^{+2}\]$
c	${2.3}_{- 0.1}^{+ 0.1}$ $\[2.3_{-0.1}^{+0.1}\]$	${6.3}_{- 0.5}^{+ 0.3}$ $\[6.3_{-0.5}^{+0.3}\]$	${9.2}_{- 0.4}^{+ 0.4}$ $\[9.2_{-0.4}^{+0.4}\]$	${3.3}_{- 0.3}^{+ 0.3}$ $\[3.3_{-0.3}^{+0.3}\]$	$6_{- 2}^{+ 2}$ $\[6_{-2}^{+2}\]$
d	${1.0}_{- 0.7}^{+ 0.6}$ $\[1.0_{-0.7}^{+0.6}\]$	${4.8}_{- 1.3}^{+ 0.9}$ $\[4.8_{-1.3}^{+0.9}\]$	${9.2}_{- 0.9}^{+ 0.7}$ $\[9.2_{-0.9}^{+0.7}\]$	$2_{- 1}^{+ 4}$ $\[2_{-1}^{+4}\]$	$6_{- 2}^{+ 2}$ $\[6_{-2}^{+2}\]$
e	${2.1}_{- 1.2}^{+ 0.4}$ $\[2.1_{-1.2}^{+0.4}\]$	${5.9}_{- 0.6}^{+ 0.9}$ $\[5.9_{-0.6}^{+0.9}\]$	${8.6}_{- 0.8}^{+ 0.7}$ $\[8.6_{-0.8}^{+0.7}\]$	${1.4}_{- 0.3}^{+ 0.4}$ $\[1.4_{-0.3}^{+0.4}\]$	$6_{- 3}^{+ 2}$ $\[6_{-3}^{+2}\]$

Notes. Measured from the group A ∩ B retrievals, providing median and ±34% confidence regions.

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