YETI observations of the young transiting planet candidate CVSO 30 b

Abstract

CVSO 30 is a unique young low-mass system, because, for the first time, a close-in transiting and a wide directly imaged planet candidates are found around a common host star. The inner companion, CVSO 30 b, is the first possible young transiting planet orbiting a previously known weak-lined T-Tauri star. With five telescopes of the 'Young Exoplanet Transit Initiative' (YETI) located in Asia, Europe and South America we monitored CVSO 30 over three years in a total of 144 nights and detected 33 fading events. In two more seasons we carried out follow-up observations with three telescopes. We can confirm that there is a change in the shape of the fading event between different observations and that the fading event even disappears and reappears. A total of 38 fading event light curves were simultaneously modelled. We derived the planetary, stellar, and geometrical properties of the system and found them slightly smaller but in agreement with the values from the discovery paper. The period of the fading event was found to be 1.36 s shorter and 100 times more precise than the previous published value. If CVSO 30 b would be a giant planet on a precessing orbit, which we cannot confirm, yet, the precession period may be shorter than previously thought. But if confirmed as a planet it would be the youngest transiting planet ever detected and will provide important constraints on planet formation and migration time-scales.

arXiv comment14 pages (20 with appendix), 7 figures (16 with appendix), 6 tables (7 with appendix)

References in corpus (36)

• Analytic Lightcurves for Planetary Transit Searches
• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• Disk Frequencies and Lifetimes in Young Clusters
• Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945
• Astrometry.net: Blind astrometric calibration of arbitrary astronomical images
• Achieving better than 1 minute accuracy in the Heliocentric and Barycentric Julian Dates
• EXOFAST: A fast exoplanetary fitting suite in IDL
• A disintegrating minor planet transiting a white dwarf
• Parameter Estimation from Time-Series Data with Correlated Errors: A Wavelet-Based Method and its Application to Transit Light Curves
• Growing the gas-giant planets by the gradual accumulation of pebbles
• Possible Disintegrating Short-Period Super-Mercury Orbiting KIC 12557548
• The Spitzer c2d Survey of Weak-line T Tauri Stars II: New Constraints on the Timescale for Planet Building
• Spitzer observations of the Orion OB1 association: disk census in the low mass stars
• The K2-ESPRINT Project. I. Discovery of the Disintegrating Rocky Planet K2-22b with a Cometary Head and Leading Tail
• Two Classes of Hot Jupiters
• The CIDA Variability Survey of Orion OB1. I: the low-mass population of Ori OB 1a and 1b
• Transit Analysis Package (TAP and autoKep): IDL Graphical User Interfaces for Extrasolar Planet Transit Photometry
• 25 Orionis: A Kinematically Distinct 10 Myr Old Group in Orion OB1a
• CSI 2264: Characterizing Young Stars in NGC 2264 with Short-Duration, Periodic Flux Dips in their Light Curves
• Planetary Formation Scenarios Revistied: Core-Accretion Versus Disk Instability
• The PTF Orion Project: a Possible Planet Transiting a T-Tauri Star
• Measurement of Spin-Orbit Misalignment and Nodal Precession for the Planet around Pre-Main-Sequence Star PTFO 8-8695 From Gravity Darkening
• The Palomar Transient Factory Orion Project: Eclipsing Binaries and Young Stellar Objects
• Follow-Up Observations of PTFO 8-8695: A 3 MYr Old T-Tauri Star Hosting a Jupiter-mass Planetary Candidate
• A Survey for Very Short-Period Planets in the Kepler Data
• Tests of the planetary hypothesis for PTFO 8-8695b
• Interplay of tidal evolution and stellar wind braking in the rotation of stars hosting massive close-in planets
• Young Exoplanet Transit Initiative (YETI)
• STK: A new CCD camera at the University Observatory Jena
• The low mass star and sub-stellar populations of the 25 Orionis group
• BATC 13-band Photometry of Open Cluster NGC 7789
• CTK - A new CCD Camera at the University Observatory Jena
• A reappraisal of parameters for the putative planet PTFO 8-8695b and its potentially precessing parent star
• Revisiting a gravity-darkened and precessing planetary system PTFO 8-8695: spin-orbit non-synchronous case
• The stellar content of the young open cluster Trumpler 37
• Investigation of a transiting planet candidate in Trumpler 37: an astrophysical false positive eclipsing spectroscopic binary star

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