Evidence that the Planetary Candidate CVSO30c is a Background Star from Optical, Seeing-limited Data
| Autor: | Poshih Chiang, Chien-Hsiu Lee |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Optical image 010504 meteorology & atmospheric sciences Infrared FOS: Physical sciences Astronomy and Astrophysics Astrophysics Planetary system Astrophysics - Astrophysics of Galaxies 01 natural sciences Subdwarf Exoplanet Photometry (optics) T Tauri star Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Substellar object 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences |
| Zdroj: | The Astrophysical Journal. 852:L24 |
| ISSN: | 2041-8213 |
| DOI: | 10.3847/2041-8213/aaa40b |
| Popis: | We report serendipitous optical imaging of CVSO30c, an exoplanet candidate associated with the pre-main sequence T Tauri star CVSO30 resides in the 25 Ori stellar cluster. We perform PSF modeling on our seeing limited optical image to remove the lights from the host star (CVSO30), allowing us to extract photometry of CVSO30c to be g = 23.2+/-0.2 (statistic)+/-0.1 (systematic) and r = 21.5+/-0.1 (statistic)+/-0.1 (systematic) magnitudes, respectively. This is 170 and 80 times too bright in the g and r-band, respectively, if CVSO30c were an L0 substellar object as suggested by previous studies. The optical/infrared colors of CVSO 30c are indicative of a stellar, not substellar object, while the object's color-magnitude diagram position is strikingly inconsistent with expected values for a low mass member of 25 Ori. Broad-band photometry for CVSO30c is instead better fit by contaminants such as a background K3 giant or M subdwarf. Our study demonstrates that optical seeing limited data can help clarify the nature of candidate wide separation planet-mass companions in young star-forming regions. 8 pages, 4 figures, ApJ Letter accepted |
| Databáze: | OpenAIRE |
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