Transits of Known Planets Orbiting a Naked-eye Star

Abstract

Some of the most scientifically valuable transiting planets are those that were already known from radial velocity (RV) surveys. This is primarily because their orbits are well characterized and they preferentially orbit bright stars that are the targets of RV surveys. The Transiting Exoplanet Survey Satellite (TESS) provides an opportunity to survey most of the known exoplanet systems in a systematic fashion to detect possible transits of their planets. HD136352 (Nu 2 Lupi) is a naked-eye (V=5.78) G-type main-sequence star that was discovered to host three planets with orbital periods of 11.6, 27.6, and 108.1 days via RV monitoring with the High Accuracy Radial velocity Planet Searcher (HARPS) spectrograph. We present the detection and characterization of transits for the two inner planets of the HD136352 system, revealing radii of-+ 0.41 g cm −3 for planets b and c, respectively, thus placing them on either side of the radius valley. The combination of the multitransiting planet system, the bright host star, and the diversity of

The TESS Objects of Interest Catalog from the TESS Prime Mission

“…The system was observed in multiple sectors in TESS year 1. Additional observations and analysis have provided more precise mass measurement for planets b and c, their large orbit misalignment, and possible theories for the formation of the system (Kane et al 2020;Xuan & Wyatt 2020;Damasso et al 2020;De Rosa et al 2020;Kunovac Hodžić et al 2021). Although π Men is a bright star, it is a viable candidate for JWST observation.…”

Transit detection of the long-period volatile-rich super-Earth ν2 Lupi d with CHEOPS

“…ν 2 Lupi (HD 136352) is a naked-eye (V = 5.78) Sun-like star that was discovered to host three low-mass planets with orbital periods of 11.6, 27.6, and 107.6 days via radial velocity monitoring 1 . The two inner planets (b and c) were recently found to transit 2 , prompting a photometric follow-up by the brand-new CHaracterising ExOPlanets Satellite (CHEOPS).…”

“…ν 2 Lupi is one of the first scientific targets observed by CHEOPS. This system of three lowmass planets orbiting one of the closest (14.7 parsecs) G-type main-sequence stars was discovered using radial velocities (RVs) obtained with the HARPS spectrograph 1 .…”

“…This includes first a custom TESS light curve, which we extracted from the target pixel files following ref. 2 , to conduct a careful treatment of instrumental systematics (see Methods and Supplementary Figure 4). We also included 246 previously published 1,2 RV measurements obtained with HARPS between May 2004 and August 2017 (see Methods and Supplementary Figure 6).…”

A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113

“…mini-Neptunes such as TOI-421 c (Carleo et al 2020), as well as planets which follow a more linear track from rocky super-earths to Neptunes dominated by gaseous envelopes, such as the two inner planets orbiting ν 2 Lupi (Kane et al 2020) and TOI-735 (Cloutier et al 2020;Nowak et al 2020).…”