# TESS Program G04116

Title: Searching Long Period Subdwarf B Binary Systems Using The Light Time Delay Method

PI: Otani, Tomomi - Embry-Riddle Aeronautical University

Type: SMALL

Summary: Our group with undergraduate students will obtain orbital solutions of subdwarf B (sdB) stars long period binaries using the pulsation timing methods. The most promising formation scenarios involve close binary star evolution with three different channels, 1. Common Envelope (CE) channel, which produces short period (P= 0.1 10 d) sdB binary systems, 2. Roche lobe overflow (RLOF) channel, which results in long period (450 < P < 1400 d) sdB binary systems, and 3. white-dwarf merger channel, which produces single sdB stars. The orbital parameters of binaries of P > 100 d are difficult to measure with conventional methods as well as proving a single sdB stars' existence, so the observational studies of 2, and 3 are incomplete. Pulsation timing methods is suitable for those researches.


# Sector 045 targets observed (2 min: 1, 20 s: 1)
171649034,159.1622,19.8673,15.44,G04116;G04091;20SECONDTARGET

# Sector 046 targets observed (2 min: 2, 20 s: 2)
171649034,159.1622,19.8673,15.44,G04116;G04091;20SECONDTARGET
47377536,162.5117,-0.0105,13.7,G04116;G04091;20SECONDTARGET

# Sector 047 targets observed (2 min: 1, 20 s: 1)
56863037,138.7308,45.3948,14.91,G04116;G04091;20SECONDTARGET

# Sector 048 targets observed (2 min: 2, 20 s: 2)
171649034,159.1622,19.8673,15.44,G04116;G04091;20SECONDTARGET
165312944,185.3712,53.0769,13.46,G04116;G04091;20SECONDTARGET

# Sector 049 targets observed (2 min: 2, 20 s: 2)
165312944,185.3712,53.0769,13.46,G04116;G04091;20SECONDTARGET
207440585,244.8608,56.0996,11.92,G04116;G04091;20SECONDTARGET

# Sector 050 targets observed (2 min: 1, 20 s: 1)
207440585,244.8608,56.0996,11.92,G04116;G04091;20SECONDTARGET

# Sector 051 targets observed (2 min: 2, 20 s: 2)
219492314,243.6952,42.46,14.63,G04116;G04091;20SECONDTARGET
207440585,244.8608,56.0996,11.92,G04116;G04091;20SECONDTARGET

# Sector 052 targets observed (2 min: 2, 20 s: 2)
207440585,244.8608,56.0996,11.92,G04116;G04091;20SECONDTARGET
219492314,243.6952,42.46,14.63,G04116;G04091;20SECONDTARGET