BD+15 2375 is a red giant star with ~1.08 times the Sun’s mass, ~8.95 times the Sun’s radius, ~37 times the Sun’s luminosity, and it has an effective temperature of roughly 4649 K. The star is located ~2520 light years away and circling it is a gas giant planet identified as BD+15 2375 b. Radial velocity measurements indicate the planet has ~1.06 times the mass of Jupiter and it is in an almost circular orbit around its host star at ~0.58 AU. The planet’s orbital period is ~153 days and it causes its host star to wobble by ~38.3 m/s. BD+15 2375 b is currently the lightest known planet around a red giant star.
Niedzielski et al. (2016), “Tracking Advanced Planetary Systems (TAPAS) with HARPS-N. III. HD 5583 and BD+15 2375 - two cool giants with warm companions”, arXiv:1601.06832 [astro-ph.EP]