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3 results on '"Payne, AV"'

1. The Spectroscopic Classification of Astronomical Transients (SCAT) Survey: Overview, Pipeline Description, Initial Results, and Future Plans

Author

Tucker, MA, Shappee, BJ, Huber, ME, Payne, AV, Do, A, Hinkle, JT, de Jaeger, T, Ashall, C, Desai, DD, Hoogendam, WB, Aldering, G, Auchettl, K, Baranec, C, Bulger, J, Chambers, K, Chun, M, Hodapp, KW, Lowe, TB, McKay, L, Rampy, R, Rubin, D, and Tonry, JL

Subjects
Space Sciences, Physical Sciences, Astronomical and Space Sciences, Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics
Abstract

Abstract: We present the Spectroscopic Classification of Astronomical Transients (SCAT) survey, which is dedicated to spectrophotometric observations of transient objects such as supernovae and tidal disruption events. SCAT uses the SuperNova Integral-Field Spectrograph (SNIFS) on the University of Hawai’i 2.2 m (UH2.2m) telescope. SNIFS was designed specifically for accurate transient spectrophotometry, including absolute flux calibration and host-galaxy removal. We describe the data reduction and calibration pipeline including spectral extraction, telluric correction, atmospheric characterization, nightly photometricity, and spectrophotometric precision. We achieve ≲5% spectrophotometry across the full optical wavelength range (3500–9000 Å) under photometric conditions. The inclusion of photometry from the SNIFS multi-filter mosaic imager allows for decent spectrophotometric calibration (10%–20%) even under unfavorable weather/atmospheric conditions. SCAT obtained ≈640 spectra of transients over the first 3 yr of operations, including supernovae of all types, active galactic nuclei, cataclysmic variables, and rare transients such as superluminous supernovae and tidal disruption events. These observations will provide the community with benchmark spectrophotometry to constrain the next generation of hydrodynamic and radiative transfer models.

Published
2022

2. Chandra, HST/STIS, NICER, Swift, and TESS Detail the Flare Evolution of the Repeating Nuclear Transient ASASSN-14ko

Author

Payne, AV, Auchettl, K, Shappee, BJ, Kochanek, CS, Boyd, PT, Holoien, TW-S, Fausnaugh, MM, Ashall, C, Hinkle, JT, Vallely, PJ, Stanek, KZ, Thompson, TA, Payne, AV, Auchettl, K, Shappee, BJ, Kochanek, CS, Boyd, PT, Holoien, TW-S, Fausnaugh, MM, Ashall, C, Hinkle, JT, Vallely, PJ, Stanek, KZ, and Thompson, TA

Abstract

ASASSN-14ko is a nuclear transient at the center of the AGN ESO 253−G003 that undergoes periodic flares. Optical flares were first observed in 2014 by the All-Sky Automated Survey for Supernovae (ASAS-SN) and their peak times are well-modeled with a period of 115.2 − 1.2 + 1.3 days and period derivative of −0.0026 ± 0.0006. Here we present ASAS-SN, Chandra, HST/STIS, NICER, Swift, and TESS data for the flares that occurred on 2020 December, 2021 April, 2021 July, and 2021 November. These four flares represent flares 18–21 of the total number of flares observed by ASAS-SN so far since 2014. The HST/STIS UV spectra evolve from blueshifted broad absorption features to redshifted broad emission features over ∼10 days. The Swift UV/optical light curves peaked as predicted by the timing model, but the peak UV luminosities that varied between flares and the UV flux in Flare 20 were roughly half the brightness of the other peaks. The X-ray luminosities consistently decreased and the spectra became harder during the UV/optical rise, but apparently without changes in absorption. Finally, two high-cadence TESS light curves from Flare 18 and Flare 12 showed that the slopes during the rising and declining phases changed over time, which indicates some stochasticity in the flare’s driving mechanism. Although ASASSN-14ko remains observationally consistent with a repeating partial tidal disruption event, these rich multi-wavelength data are in need of a detailed theoretical model.

Published
2023

3. Cognitive vulnerability to depression in individuals with borderline personality disorder.

Author

Abela JR, Payne AV, and Moussaly N

Subjects
Adult, Attitude, Cognition Disorders diagnosis, Female, Humans, Male, Middle Aged, Neuropsychological Tests, Self Concept, Surveys and Questionnaires, Cognition Disorders epidemiology, Cognition Disorders etiology, Depressive Disorder, Major psychology
Abstract

The goal of the current study was to examine whether individuals with comorbid Major Depressive Disorder (MDD) and Borderline Personality Disorder (BPD) exhibit greater severity of depressive symptoms than (1) individuals with MDD without BPD and (2) individuals with neither MDD nor BPD. One hundred and forty-one individuals participated in a semi-structured clinical interview assessing MDD and BPD. They also completed measures assessing depressive symptoms, depressogenic attributional style, hopelessness, self-esteem, rumination, and dysfunctional attitudes. In line with hypotheses, individuals with BPD and MDD exhibited higher levels of depressive symptoms and cognitive vulnerability than individuals in the other two groups. In addition, after controlling for the effects of cognitive vulnerability, the effect of group membership on depressive symptoms was reduced, suggesting that the increased severity of depressive symptoms experienced by those with BPD is partially due to their possessing higher levels of cognitive vulnerability to depression.

Published
2003
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