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Low-Mass Companions to Nine Stars

Niedzielski A., Jaros R., Srivastava D., Adamów M., Wolszczan A., Villaver E., Maciejewski G., Deka-Szymankiewicz B.

Acta Astronomica

2025

Vol. 75, No. 2

63--95

We present an independent spectroscopic and radial velocity analysis for nine stars from the Pennsylvania-Toruń Planet Search. For BD+24 4697, we present an updated true companion's mass (0.16±0.02 M⊙) as well as evidence of stellar activity. For BD+54 1640 and BD+65 1241 we present true masses of companions, m=0.15±0.04 M⊙) and m=0.091± 0.005 M⊙), respectively. For BD+63 974 and BD+69 935 we find low mass companions with m sin i=0.046±0.001 M⊙) and m sin i=0.090±0.005 M⊙). For BD+52 1281, BD+54 1382, TYC 2704-2680-1, and TYC 3525-02043-1 we present evidence of low-mass companions with m sin i of 0.115±0.006 M⊙), 0.083±0.007 M⊙), 0.279±0.009 M⊙), and 0.064±0.006 M⊙), respectively. Consequently, BD+54 1382, BD+63 974, BD+65 1241, BD+69 935 and TYC 3525-02043-1 appear to be brown dwarf host candidates.

Planetary-Mass Companions to a Retired B star BD+37 3172 and a Retired F Star BD+42 2315

Niedzielski A., Jaros R., Paczuski A., Adamów M., Wolszczan A., Villaver E., Maciejewski G., Deka-Szymankiewicz B.

Acta Astronomica

2023

Vol. 73, No. 4

291--313

Radial velocity searches may lead to detection of exoplanets at large orbital separations only if long-enough time-series of data are available. Therefore publication of precise measurements collected in the past is very valuable even if not successfully completed with a definitive detection. Here we present 309 precise (σRV≈5-7 m/s) multi-epoch radial velocities for 28 stars observed with the Hobby-Eberly Telescope and its High Resolution Spectrograph between 2004 and 2013. Based on the observations gathered we present a low mass companion to a M=3.75±0.86 M⊙, K giant BD+37 3172 (mpsin i=10.6 MJ in 1887.76±0.01 d, 4.65 au orbit with e=0.59±0.01) and a planetary mass companion to M=1.38±0.30 M⊙, K giant BD+42 2315 (mpsin i=0.55 M in 123.05±0.04 d, 0.55 au orbit with e=0.73±0.03). We also present two preliminary detections of new spectroscopic binaries: BD+56 2957 (K5) and HD 236555 (G5).