A hot super-Earth planet in the WASP-84 planetary system

Abstract

Hot Jupiters have been perceived as loners devoid of planetary companions in close orbital proximity. However, recent discoveries based on space-borne precise photometry have revealed that at least some fraction of giant planets coexists with low-mass planets in compact orbital architectures. We report detecting a 1.446-day transit-like signal in the photometric time series acquired with the Transiting Exoplanet Survey Satellite (TESS) for the WASP-84 system, which is known to contain a hot Jupiter on a circular 8.5-day orbit. The planet was validated based on TESS photometry, and its signal was distilled in radial velocity measurements. The joint analysis of photometric and Doppler data resulted in a multi-planetary model of the system. With a mass of $15M_{\oplus }$, radius of $2R_{\oplus }$, and orbital distance of 0.024 au, the new planet WASP-84 c was classified as a hot super-Earth with the equilibrium temperature of 1300 K. A growing number of companions to hot Jupiters indicates that a non-negligible part of them must have formed under a quiescent scenario such as disc migration or in-situ formation.

Accepted for publication in MNRAS Letters, updated with additional materials to reflect the published version

References in corpus (27)

• The Transiting Exoplanet Survey Satellite
• A 3D Dust Map Based on Gaia, Pan-STARRS 1 and 2MASS
• A box-fitting algorithm in the search for periodic transits
• AstroImageJ: Image Processing and Photometric Extraction for Ultra-Precise Astronomical Light Curves
• AstroImageJ: Image Processing and Photometric Extraction for Ultra-Precise Astronomical Light Curves (Expanded Edition)
• Origins of Hot Jupiters
• Growth Model Interpretation of Planet Size Distribution
• Spectrum radial velocity analyser (SERVAL). High-precision radial velocities and two alternative spectral indicators
• False positive probabilties for all Kepler Objects of Interest: 1284 newly validated planets and 428 likely false positives
• The GAPS Programme with HARPS-N@TNG XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets
• WASP-47: A Hot Jupiter System with Two Additional Planets Discovered by K2
• An Efficient Automated Validation Procedure for Exoplanet Transit Candidates
• Warm Jupiters are less lonely than hot Jupiters: close neighbours
• Dos and don'ts of reduced chi-squared
• Vetting of 384 TESS Objects of Interest with TRICERATOPS and Statistical Validation of 12 Planet Candidates
• Systemic: A Testbed For Characterizing the Detection of Extrasolar Planets. I. The Systemic Console Package
• Three sub-Jupiter-mass planets: WASP-69b & WASP-84b transit active K dwarfs and WASP-70Ab transits the evolved primary of a G4+K3 binary
• On The Origins Of Eccentric Close-in Planets
• A Lucky Imaging search for stellar sources near 74 transit hosts
• TESS spots a hot Jupiter with an inner transiting Neptune
• Kepler-730: A hot Jupiter system with a close-in, transiting, Earth-sized planet
• The Discovery of a Planetary Companion Interior to Hot Jupiter WASP-132 b
• Evidence for Two Hot Jupiter Formation Paths
• The well-aligned orbit of WASP-84b: evidence for disc migration
• Revisiting WASP-47 with ESPRESSO and TESS
• Efficient analysis in planet transit surveys
• FluxCT: A Web Tool for Identifying Contaminating Flux in Kepler and TESS Target Pixel Files

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• Shallower radius valley around low-mass hosts: Evidence for icy planets, collisions or high-energy radiation scatter
• TOI-1408: Discovery and Photodynamical Modeling of a Small Inner Companion to a Hot Jupiter Revealed by TTVs
• The SHERLOCK pipeline: new exoplanet candidates in the WASP-16, HAT-P-27, HAT-P-26, and TOI-2411 systems
• Characterisation of the Warm-Jupiter TOI-1130 system with CHEOPS and photo-dynamical approach
• Architecture Classification for Extrasolar Planetary Systems
• A close outer companion to the ultra-hot Jupiter TOI-2109 b?
• Evidence for Primordial Alignment II: Insights from Stellar Obliquity Measurements for Hot Jupiters in Compact Multiplanet Systems
• Discovery of a cold giant planet and mass measurement of a hot super-Earth in the multi-planetary system WASP-132
• Homogeneous search for spot transits in Kepler and TESS photometry of K $-$ M-type main-sequence stars