TL;DR
This paper investigates unusual, erratic transits observed in the star HD 139139 by analyzing new data and proposing three novel hypotheses, aiming to explain the irregular transit signals detected by Kepler.
Contribution
It introduces three new potential explanations for the erratic transits of HD 139139, expanding beyond previous hypotheses and analyzing their likelihood based on recent data.
Findings
Radial velocity data exclude a close-in planet around HD 139139.
The star's erratic transits may be caused by an eccentric transiting belt, interstellar objects, or Solar System objects.
Previous hypotheses are insufficient to explain the observed transit behavior.
Abstract
The NASA mission Kepler has detected 28 transits with depths and durations hours in the light curve of HD139139 during a 87 days campaign . Their arrival times are erratic. Rappaport et al. (2019) discard ten explanations. It is not clear if the transits are for HD 139139 or for a star B at 3.3 arcsec. New radial velocity variation data give RV for HD139139 in 4 days (F. Bouchy and S. Udry, private communication) excluding a close-in planet orbiting HD 139139, as proposed earlier (Schneider 2019). (However, this explanation is still valid for the star B for which radial velocity data are very poor). Here I thus explore new tentative explanations and their likelihood: 1/ An eccentric transiters belt around HD 139139 2/ Interstellar transiters 3/ Solar System objects.
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