Discovery of a Short Period Pulsator from Istanbul University Observatory

Abstract

We report the discovery of a new short period pulsating variable in the field of exoplanet host star XO-2. Variable has been identified while it was being used as a comparison. In order to verify the variability of the candidate, a comprehensive follow-up was carried out. Period analysis of multi-band light curves revealed a very prominent and consistent pulsation periodicity ofP∼0.95" role="presentation" style="display: inline-block; line-height: 0; font-size: 17.219999313354492px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; caret-color: rgb(17, 17, 17); color: rgb(17, 17, 17); font-family: Poppins; position: relative;">P∼0.95hours. Given the variability period, amplitude and the color index, the object is most likely a emph{delta Scuti} type variable. Absolute magnitude (Mv" role="presentation" style="display: inline-block; line-height: 0; font-size: 17.219999313354492px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; caret-color: rgb(17, 17, 17); color: rgb(17, 17, 17); font-family: Poppins; position: relative;">Mv) and the color index(B−V)0" role="presentation" style="display: inline-block; line-height: 0; font-size: 17.219999313354492px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; caret-color: rgb(17, 17, 17); color: rgb(17, 17, 17); font-family: Poppins; position: relative;">(B−V)0of the star determined as2.76" role="presentation" style="display: inline-block; line-height: 0; font-size: 17.219999313354492px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; caret-color: rgb(17, 17, 17); color: rgb(17, 17, 17); font-family: Poppins; position: relative;">2.76and0.22" role="presentation" style="display: inline-block; line-height: 0; font-size: 17.219999313354492px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; caret-color: rgb(17, 17, 17); color: rgb(17, 17, 17); font-family: Poppins; position: relative;">0.22, respectively. This(B−V)0" role="presentation" style="display: inline-block; line-height: 0; font-size: 17.219999313354492px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; caret-color: rgb(17, 17, 17); color: rgb(17, 17, 17); font-family: Poppins; position: relative;">(B−V)0of the star corresponds to A7 spectral type with an approximate effective temperature of 7725 K. Machine-learning analysis of the time-series data also revealed that the object is of variable type DSCT with a probability of 78%.