分类： 天文学 >> 天文学 提交时间： 2023-02-19
Emil Knudstrup
Simon H. Albrecht
Davide Gandolfi
Marcus L. Marcussen
Elisa Goffo
Luisa M. Serrano
Fei Dai
Seth Redfield
Teruyuki Hirano
Szilárd Csizmadia
William D. Cochran
Hans J. Deeg
Malcolm Fridlund
Kristine W. F. Lam
John H. Livingston
Rafael Luque
Norio Narita
Enric Palle
Carina M. Persson
Vincent Van Eylen
摘要： TOI-640 b is a hot, puffy Jupiter with a mass of $0.57 \pm 0.02$ M$_{\rm J}$ and radius of $1.72 \pm 0.05$ R$_{\rm J}$, orbiting a slightly evolved F-type star with a separation of $6.33^{+0.07}_{-0.06}$ R$_\star$. Through spectroscopic in-transit observations made with the HARPS spectrograph, we measured the Rossiter-McLaughlin effect, analysing both in-transit radial velocities and the distortion of the stellar spectral lines. From these observations, we find the host star to have a projected obliquity of $\lambda=184\pm3^\circ$. From the TESS light curve, we measured the stellar rotation period, allowing us to determine the stellar inclination, $i_\star=23^{+3\circ}_{-2}$, meaning we are viewing the star pole-on. Combining this with the orbital inclination allowed us to calculate the host star obliquity, $\psi=104\pm2^\circ$. TOI-640 b joins a group of planets orbiting over stellar poles within the range $80^\circ-125^\circ$. The origin of this orbital configuration is not well understood.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
F. Murgas
G. Nowak
T. Masseron
H. Parviainen
R. Luque
E. Pallé
Judith Korth
I. Carleo
Sz. Csizmadia
E. Esparza-Borges
Ahlam Alqasim
William D. Cochran
Fei Dai
Hans J. Deeg
D. Gandolfi
Elisa Goffo
Petr Kabáth
K. W. F. Lam
John Livingston
Alexandra Muresan
摘要： We used TESS light curves and HARPS-N spectrograph radial velocity measurements to establish the physical properties of the transiting exoplanet candidate found around the star HD 20329 (TOI-4524). We performed a joint fit of the light curves and radial velocity time series to measure the mass, radius, and orbital parameters of the candidate. We confirm and characterize HD 20329b, an ultra-short-period (USP) planet transiting a solar-type star. The host star (HD 20329, $V = 8.74$ mag, $J = 7.5$ mag) is characterized by its G5 spectral type with $\mathrm{M}_\star= 0.90 \pm 0.05$ M$_\odot$, $\mathrm{R}_\star = 1.13 \pm 0.02$ R$_\odot$, and $\mathrm{T}_{\mathrm{eff}} = 5596 \pm 50$ K; it is located at a distance $d= 63.68 \pm 0.29$ pc. By jointly fitting the available TESS transit light curves and follow-up radial velocity measurements, we find an orbital period of $0.9261 \pm (0.5\times 10^{-4})$ days, a planetary radius of $1.72 \pm 0.07$ $\mathrm{R}_\oplus$, and a mass of $7.42 \pm 1.09$ $\mathrm{M}_\oplus$, implying a mean density of $\rho_\mathrm{p} = 8.06 \pm 1.53$ g cm$^{-3}$. HD 20329b joins the $\sim$30 currently known USP planets with radius and Doppler mass measurements.
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