Exploring the directly imaged HD 1160 system through spectroscopic characterization and high-cadence variability monitoring.
In: Monthly Notices of the Royal Astronomical Society, Jg. 531 (2024-06-15), Heft 1, S. 2168-2189
Online
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Zugriff:
The time variability and spectra of directly imaged companions provide insight into their physical properties and atmospheric dynamics. We present follow-up R ∼ 40 spectrophotometric monitoring of red companion HD 1160 B at 2.8–4.2 μ m using the double-grating 360° vector Apodizing Phase Plate (dgvAPP360) coronagraph and ALES integral field spectrograph on the Large Binocular Telescope Interferometer. We use the recently developed technique of gvAPP-enabled differential spectrophotometry to produce differential light curves for HD 1160 B. We reproduce the previously reported ∼3.2 h periodic variability in archival data, but detect no periodic variability in new observations taken the following night with a similar 3.5 per cent level precision, suggesting rapid evolution in the variability of HD 1160 B. We also extract complementary spectra of HD 1160 B for each night. The two are mostly consistent, but the companion appears fainter on the second night between 3.0–3.2 μ m. Fitting models to these spectra produces different values for physical properties depending on the night considered. We find an effective temperature T eff = |$2794^{+115}_{-133}$| K on the first night, consistent with the literature, but a cooler T eff = |$2279^{+79}_{-157}$| K on the next. We estimate the mass of HD 1160 B to be 16–81 M Jup, depending on its age. We also present R = 50 000 high-resolution optical spectroscopy of host star HD 1160 A obtained simultaneously with the PEPSI spectrograph. We reclassify its spectral type to A1 IV-V and measure its projected rotational velocity |$\upsilon \sin i$| = |$96^{+6}_{-4}$| km s−1. We thus highlight that gvAPP-enabled differential spectrophotometry can achieve repeatable few per cent level precision and does not yet reach a systematic noise floor, suggesting greater precision is achievable with additional data or advanced detrending techniques. [ABSTRACT FROM AUTHOR]
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Exploring the directly imaged HD 1160 system through spectroscopic characterization and high-cadence variability monitoring.
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Autor/in / Beteiligte Person: | Sutlieff, Ben J ; Birkby, Jayne L ; Stone, Jordan M ; Derkink, Annelotte ; Backs, Frank ; Doelman, David S ; Kenworthy, Matthew A ; Bohn, Alexander J ; Ertel, Steve ; Snik, Frans ; Woodward, Charles E ; Ilyin, Ilya ; Skemer, Andrew J ; Leisenring, Jarron M ; Strassmeier, Klaus G ; (王吉), Ji Wang ; Charbonneau, David ; Biller, Beth A |
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Zeitschrift: | Monthly Notices of the Royal Astronomical Society, Jg. 531 (2024-06-15), Heft 1, S. 2168-2189 |
Veröffentlichung: | 2024 |
Medientyp: | academicJournal |
ISSN: | 0035-8711 (print) |
DOI: | 10.1093/mnras/stae1315 |
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