# TESS Program G04131

Title: Deciphering Complex Structure In Period-Phased Lightcurves Of Young Low Mass Stars: "Batwings" And "Complex Rotators"

PI: Hillenbrand, Lynne - California Institute Of Technology

Type: SMALL

Summary: We propose analysis of TESS lightcurves and simultaneously obtained optical high-dispersion spectroscopy for stars exhibiting a newly appreciated type of periodic variability. Known members of the ``batwing" or ``complex rotator" lightcurve morphology class are all M-type stars younger than a few tens of millions of years. The sample undoubtedly will expand as examination of TESS data proceeds. Our ground-based program consists of continuous spectra obtained at all phases throughout the short (<1 day) rotation periods. Spectroscopic time series enable more physical constraints on what is causing the unusual and varied patterns in the phased lightcurves of this sample. Specific theoretical predictions of gas/dust entrainment will be tested including magnetic/dynamical shepherding.


# Sector 043 targets observed (2 min: 7, 20 s: 0)
118769116,70.2226,20.9295,14.58,G04168;G04236;G04131
245868207,68.805,17.4304,12.96,G04240;G04236;G04131;G04181;G04085
245874053,68.9821,17.1276,13.26,G04236;G04131;G04181
245902096,69.4148,15.4893,12.61,G04131
59091144,74.7696,14.3489,12.69,G04168;G04131
59129133,74.8684,14.2732,12.88,G04168;G04131
268324578,68.0745,24.3707,14.04,G04236;G04131;G04246;G04181;G04085

# Sector 044 targets observed (2 min: 7, 20 s: 0)
268324578,68.0745,24.3707,14.04,G04236;G04131;G04246;G04181;G04085
118769116,70.2226,20.9295,14.58,G04168;G04236;G04131
245868207,68.805,17.4304,12.96,G04240;G04236;G04131;G04181;G04085
245874053,68.9821,17.1276,13.26,G04236;G04131;G04181
245902096,69.4148,15.4893,12.61,G04131
59091144,74.7696,14.3489,12.69,G04168;G04131
59129133,74.8684,14.2732,12.88,G04168;G04131