IRTF Data Archive Program Information

# # Program information file # PROGRAM_ID 2022B980 PROGRAM_TITLE DDT Program: The Composition of a White Dwarf PROGRAM_INV1 Carl Melis PROGRAM_INV2 PROGRAM_INV3 PROGRAM_INV4 PROGRAM_INV5 PROGRAM_SCICAT stellar PROGRAM_ABSTRACT_BEG We have identified SDSSJ1957+3404 to be a polluted white dwarf star that is accreting extremely iron-rich material, suggesting that it is being polluted by the core of a massive, differentiated rocky body. Gemini NIRI near-infrared imaging photometry observations demonstrate that the white dwarf is host to excess infrared emission likely from a circumstellar dusty disk. However, the J-band NIRI measurement falls significantly below the stellar continuum level, an unprecedented result for hydrogen atmosphere white dwarfs of comparable effective temperature. We have confirmed the anomalously low J-band flux level with archival UKIDSS data and hypothesize it is the result of solid-state absorption from dust in the circumstellar disk. SpeX prism mode spectra can help us identify the feature and use it to constrain the amount of non-core material contributing to our measured abundances. PROGRAM_ABSTRACT_END