The Disk Physical Conditions of 48 Persei Constrained by Contemporaneous Hα Spectroscopy and Interferometry

Jones, C. E.; Sigut, T. A. A.; Grzenia, B. J.; Tycner, C.; Zavala, R. T.

doi:10.3847/1538-4357/aa72e4

Cited by 11 publications

(9 citation statements)

References 34 publications

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“…Note that this value is still lower than the general expectation of about 50%. The detailed classification algorithms differ; photometric identifications of SNe Ia in SDSS (Sako et al 2011) and Pan-STARRS1 (Jones et al 2017) SN surveys show a similarly low SN Ia fraction. Figure 16; absolute magnitudes as a function of redshift are shown in Figure 17.…”

Section: Supernova Candidatesmentioning

confidence: 99%

The Hyper Suprime-Cam SSP transient survey in COSMOS: Overview

Yasuda

Tanaka

Tominaga

et al. 2019

Publications of the Astronomical Society of Japan

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We present an overview of a deep transient survey of the COSMOS field with the Subaru Hyper Suprime-Cam (HSC). The survey was performed for the 1.77 deg 2 ultra-deep layer and 5.78 deg 2 deep layer in the Subaru Strategic Program over 6-and 4-month periods from 2016 to 2017, respectively. The ultra-deep layer shows a median depth per epoch of 26.4, 26.3, 26.0, 25.6, and 24.6 mag in g, r, i, z, and y bands, respectively; the deep layer is ∼ 0.6 mag shallower. In total, 1,824 supernova candidates were identified. Based on light curve fitting and derived light curve shape parameter, we classified 433 objects as Type Ia supernovae (SNe); among these candidates, 129 objects have spectroscopic or COSMOS2015 photometric redshifts and 58 objects are located at z > 1. Our unique dataset doubles the number of Type Ia SNe at z > 1 and enables various time-domain analyses of Type II SNe, high redshift superluminous SNe, variable stars, and active galactic nuclei.

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Section: Supernova Candidatesmentioning

confidence: 99%

The Hyper Suprime-Cam SSP transient survey in COSMOS: Overview

Yasuda

Tanaka

Tominaga

et al. 2019

Publications of the Astronomical Society of Japan

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“…" Horch et al (2020) lists it as unresolved (2015.8343) at 692 nm with detection limit ∆m of 4.72 at 200 mas, and Wang et al (2018), searching archival IUE spectra for hot sdO companions to Be stars, found no indication of such in this system. Jones et al (2017) spatially resolved the Hα emitting region using NPOI and determined that disk emission originates in a moderately large disk with a radius of 25 stellar radii, thus excluding the possibility of very close binary companions.…”

Section: ψ Permentioning

confidence: 99%

“…LBOI has been extremely successful in the direct resolution of Be stars disks, with many examples provided by interferometers such as the Mark III Stellar Interferometer (Quirrenbach et al 1994, ζ Tau) and the Navy Precision Optical Interferometer (NPOI; Tycner et al 2003Tycner et al , 2004Tycner et al , 2005Tycner et al , 2006Tycner et al , 2008Sigut et al 2015;Jones et al 2017, including o Aqr, γ Cas, β CMi, χ Oph, 48 Per, φ Per, η Tau, and ζ Tau). These studies utilized measurements obtained simultaneously in many spectral channels covering a wide spectral range where the source is unresolved, or weakly resolved (the continuum emission from the photosphere of the central star) to calibrate the data in one or two spectral channels containing a strong signal in the Hα line originating in the optically thick circumstellar envelope that is clearly resolved in nearer sources.…”

Section: Introductionmentioning

confidence: 99%

“…These studies utilized measurements obtained simultaneously in many spectral channels covering a wide spectral range where the source is unresolved, or weakly resolved (the continuum emission from the photosphere of the central star) to calibrate the data in one or two spectral channels containing a strong signal in the Hα line originating in the optically thick circumstellar envelope that is clearly resolved in nearer sources. Modeling of these data has quantified the extent, orientation, and brightness profile of these disks, and in some cases directly constrained non-LTE models of disk temperature and density distribution (Jones et al 2017). Currently archived NPOI data exist for perhaps another half-dozen sources where the circumstellar emmision is sufficiently resolved for such studies, including binary systems where it may be possible to study the mutual inclination between the Be star disk and a companion star's orbit.…”

Section: Introductionmentioning

confidence: 99%

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Surveying the Bright Stars by Optical Interferometry. II. A Volume-limited Multiplicity Survey of Main-sequence F Stars

Hutter

Tycner

Zavala

et al. 2019

ApJS

Self Cite

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We present the results of a multiplicity survey for a magnitude-limited sample of 31 classical Be stars conducted with the Navy Precision Optical Interferometer and the Mark III Stellar Interferometer. The interferometric observations were used to detect companions in ten previously known binary systems. For two of these sources (66 Oph and β Cep) new orbital solutions were obtained, while for a third source (υ Sgr) our observations provide the first direct, visual detection of the hot sdO companion to the Be primary star. Combining our interferometric observations with an extensive literature search, we conclude that an additional four sources (o Cas, 15 Mon, β Lyr, and β Cep) also contain wider binary components that are physical companions to the narrow binaries, thus forming hierarchical multiple systems. Among the sources not previously confirmed as spectroscopic or visual binaries, BK Cam was resolved on a number of nights within a close physical proximity of another star with relative motion possibly suggesting a physical binary. Combining our interferometric observations with an extensive literature search, we provide a detailed listing of companions known around each star in the sample, and discuss the multiplicity frequency in the sample. We also discuss the prospects for future multiplicity studies of classical Be stars by long baseline optical interferometry.

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“…Carciofi (2011) used the VDD model to construct the basis of new paradigm for the interpretation of Be stars observations. Then, it was widely used to successfully model Be stars Silaj et al, 2010;Touhami et al, 2011;Carciofi et al, 2012;Klement et al, 2015;Vieira et al, 2015;Faes et al, 2016;Arcos et al, 2017;Jones et al, 2017;Klement et al, 2017;Vieira et al, 2017;Marr et al, 2018;Rímulo et al, 2018). More details about the VDD model can be found in Sect.…”

Section: The Disks Of Be Starsmentioning

confidence: 99%

A Multi-technique Study of the Dynamical Evolution of the Viscous Disk around the Be Star CMa

Ghoreyshi

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The observed emission lines of Be stars originate from a circumstellar Keplerian disk that are generally well explained by the Viscous Decretion Disk model. In an earlier work we performed the modeling of the full light curve of the bright Be star ω CMa (Ghoreyshi et al. 2018) with the 1-D time-dependent hydrodynamics code SINGLEBE and the Monte Carlo radiative-transfer code HDUST. We used the V-band light curve that probes the inner disk through four disk formation and dissipation cycles. This new study compares predictions of the same set of model parameters with time-resolved photometry from the near UV through the mid-infrared, comprehensive series of optical spectra, and optical broad-band polarimetry, that overall represent a larger volume of the disk. Qualitatively, the models reproduce the trends in the observed data due to the growth and decay of the disk. However, quantitative differences exist, e.g., an overprediction of the flux increasing with wavelength, too slow decreases in Balmer emission-line strength that are too slow during disk dissipation, and the discrepancy between the range of polarimetric data and the model. We find that a larger value of the viscosity parameter alone, or a truncated disk by a companion star, reduces these discrepancies by increasing the dissipation rate in the outer regions of the disk.

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The Disk Physical Conditions of 48 Persei Constrained by Contemporaneous Hα Spectroscopy and Interferometry

Cited by 11 publications

References 34 publications

The Hyper Suprime-Cam SSP transient survey in COSMOS: Overview

The Hyper Suprime-Cam SSP transient survey in COSMOS: Overview

Surveying the Bright Stars by Optical Interferometry. II. A Volume-limited Multiplicity Survey of Main-sequence F Stars

A Multi-technique Study of the Dynamical Evolution of the Viscous Disk around the Be Star CMa

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