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Start Over Author "Chandra, Vedant" Journal monthly notices of the royal astronomical society
6 results on '"Chandra, Vedant"'

1. Extending the Chemical Reach of the H3 Survey: Detailed Abundances of the Dwarf-galaxy Stellar Stream Wukong/LMS-1

Author

Limberg, Guilherme, primary, Ji, Alexander P, additional, Naidu, Rohan P, additional, Chiti, Anirudh, additional, Rossi, Silvia, additional, Usman, Sam A, additional, Ting, Yuan-Sen, additional, Zaritsky, Dennis, additional, Bonaca, Ana, additional, Borbolato, Lais, additional, Speagle, Joshua S, additional, Chandra, Vedant, additional, and Conroy, Charlie, additional

Published
2024
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2. The SN Ia runaway LP 398-9: detection of circumstellar material and surface rotation

Author

Chandra, Vedant, primary, Hwang, Hsiang-Chih, additional, Zakamska, Nadia L, additional, Blouin, Simon, additional, Swan, Andrew, additional, Marsh, Thomas R, additional, Shen, Ken J, additional, Gänsicke, Boris T, additional, Hermes, J J, additional, Putterman, Odelia, additional, Bauer, Evan B, additional, Petrosky, Evan, additional, Dhillon, Vikram S, additional, Littlefair, Stuart P, additional, and Ashley, Richard P, additional

Published
2022
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5. SN Ia runaway LP 398-9: detection of circumstellar material and surface rotation.

Author

Chandra, Vedant, Hwang, Hsiang-Chih, Zakamska, Nadia L, Blouin, Simon, Swan, Andrew, Marsh, Thomas R, Shen, Ken J, Gänsicke, Boris T, Hermes, J J, Putterman, Odelia, Bauer, Evan B, Petrosky, Evan, Dhillon, Vikram S, Littlefair, Stuart P, and Ashley, Richard P

Subjects
*TYPE I supernovae, *SURFACES (Technology), *SUPERNOVA remnants, *ROTATIONAL motion, *CIRCUMSTELLAR matter, *LIGHT curves
Abstract

A promising progenitor scenario for Type Ia supernovae (SNeIa) is the thermonuclear detonation of a white dwarf in a close binary system with another white dwarf. After the primary star explodes, the surviving donor can be spontaneously released as a hypervelocity runaway. One such runaway donor candidate is LP 398-9, whose orbital trajectory traces back ≈105 yr to a known supernova remnant. Here, we report the discovery of carbon-rich circumstellar material around LP 398-9, revealed by a strong infrared excess and analysed with follow-up spectroscopy. The circumstellar material is most plausibly composed of inflated layers from the star itself, mechanically and radioactively heated by the past companion's supernova. We also detect a 15.4 h periodic signal in the UV and optical light curves of LP 398-9, which we interpret as surface rotation. The rotation rate is consistent with theoretical predictions from this supernova mechanism, and the brightness variations could originate from surface inhomogeneity deposited by the supernova itself. Our observations strengthen the case for this double-degenerate SNIa progenitor channel, and motivate the search for more runaway SNIa donors. [ABSTRACT FROM AUTHOR]

Published
2022
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