Gail Schaefer
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View article: The CHARA Array Polarization Model and Prospects for Spectropolarimetry
The CHARA Array Polarization Model and Prospects for Spectropolarimetry Open
Polarimetric data provide key insights into infrared emission mechanisms in the inner disks of young stellar objects (YSOs) and the details of dust formation around asymptotic giant branch (AGB) stars. While polarization measurements are w…
View article: The CHARA Array Polarization Model and Prospects for Spectropolarimetry
The CHARA Array Polarization Model and Prospects for Spectropolarimetry Open
Polarimetric data provide key insights into infrared emission mechanisms in the inner disks of YSOs and the details of dust formation around AGB stars. While polarization measurements are well-established in radio interferometry, they rema…
View article: A detailed analysis of the Gl 486 planetary system
A detailed analysis of the Gl 486 planetary system Open
Context . The Gl 486 system consists of a very nearby, relatively bright, weakly active M3.5 V star at just 8 pc with a warm transiting rocky planet of about 1.3 R ⊕ and 3.0 M ⊕ . It is ideal for both transmission and emission spectroscopy…
View article: Orbital and Physical Properties of the Pleiades Binary 27 Tau (Atlas)
Orbital and Physical Properties of the Pleiades Binary 27 Tau (Atlas) Open
We report new spectroscopic and interferometric observations of the Pleiades binary star Atlas, which played an important role nearly 3 decades ago in settling the debate over the distance to the cluster from ground-based and space-based d…
View article: Orbital and Physical Properties of the Pleiades Binary 27 Tau (Atlas)
Orbital and Physical Properties of the Pleiades Binary 27 Tau (Atlas) Open
We report new spectroscopic and interferometric observations of the Pleiades binary star Atlas, which played an important role nearly three decades ago in settling the debate over the distance to the cluster from ground-based and space-bas…
View article: Precise Age for the Binary HD 21278 in the Young <i>α</i> Persei Cluster
Precise Age for the Binary HD 21278 in the Young <i>α</i> Persei Cluster Open
We present a study of the double-lined spectroscopic binary HD 21278 that contains one of the brightest main-sequence stars in the young α Persei open cluster. We analyzed new spectra and reanalyzed archived spectra to measure precise new …
View article: Precise Age For The Binary HD 21278 In The Young Alpha Persei Cluster
Precise Age For The Binary HD 21278 In The Young Alpha Persei Cluster Open
We present a study of the double-lined spectroscopic binary HD 21278 that contains one of the brightest main sequence stars in the young $α$ Persei open cluster. We analyzed new spectra and reanalyzed archived spectra to measure precise ne…
View article: The Dynamic Inner Disk of a Planet-forming Star
The Dynamic Inner Disk of a Planet-forming Star Open
Planets are a natural byproduct of the stellar formation process, resulting from local aggregations of material within the disks surrounding young stars. Whereas signatures of gas-giant planets at large orbital separations have been observ…
View article: Newborn Be star systems observed shortly after mass transfer
Newborn Be star systems observed shortly after mass transfer Open
Context. Many classical Be stars acquire their very rapid rotation by mass- and angular-momentum transfer in massive binaries, marking the first phase of the evolutionary chain. Later-stage products, such as Be+subdwarf- and Be+neutron-sta…
View article: Newborn Be star systems observed shortly after mass transfer
Newborn Be star systems observed shortly after mass transfer Open
Many classical Be stars acquire their very rapid rotation by mass and angular-momentum transfer in massive binaries. Short-lived intermediate-phase objects have only been discovered recently. Data archives and the literature have been sear…
View article: Sites of Planet Formation in Binary Systems. II. Double the Disks in DF Tau
Sites of Planet Formation in Binary Systems. II. Double the Disks in DF Tau Open
This article presents the latest results of our Atacama Large Millimeter/submillimeter Array (ALMA) program to study circumstellar disk characteristics as a function of orbital and stellar properties in a sample of young binary star system…
View article: Multiplicity of Galactic Cepheids from long-baseline interferometry
Multiplicity of Galactic Cepheids from long-baseline interferometry Open
Aims. We aim to accurately measure the dynamical mass and distance of Cepheids by combining radial velocity measurements with interferometric observations. Cepheid mass measurements are particularly necessary for solving the Cepheid mass d…
View article: A Spectroscopic and Interferometric Study of W Serpentis Stars. I. Circumbinary Outflow in the Interacting Binary W Serpentis
A Spectroscopic and Interferometric Study of W Serpentis Stars. I. Circumbinary Outflow in the Interacting Binary W Serpentis Open
W Serpentis is an eclipsing binary system and the prototype of the Serpentid class of variable stars. These are interacting binaries experiencing intense mass transfer and mass loss. However, the identities and properties of both stars in …
View article: Visual Orbits of Wolf–Rayet Stars. II. The Orbit of the Nitrogen-rich Wolf–Rayet Binary WR 138 Measured with the CHARA Array
Visual Orbits of Wolf–Rayet Stars. II. The Orbit of the Nitrogen-rich Wolf–Rayet Binary WR 138 Measured with the CHARA Array Open
Classical Wolf–Rayet (WR) stars are descendants of massive OB-type stars that have lost their hydrogen-rich envelopes and are in the final stages of stellar evolution, possibly exploding as Type Ib/c supernovae. It is understood that the m…
View article: Visual Orbits of Wolf–Rayet Stars. I. The Orbit of the Dust-producing Wolf–Rayet Binary WR 137 Measured with the CHARA Array
Visual Orbits of Wolf–Rayet Stars. I. The Orbit of the Dust-producing Wolf–Rayet Binary WR 137 Measured with the CHARA Array Open
Classical Wolf–Rayet (W-R) stars are the descendants of massive OB stars that have lost their hydrogen envelopes and are burning helium in their cores prior to exploding as Type Ib/c supernovae. The mechanisms for losing their hydrogen env…
View article: Multiplicity of Galactic Cepheids from long-baseline interferometry V. High-accuracy orbital parallax and mass of SU Cygni
Multiplicity of Galactic Cepheids from long-baseline interferometry V. High-accuracy orbital parallax and mass of SU Cygni Open
Cepheid masses are particularly necessary to help solving the mass discrepancy, while independent distance determinations provide crucial test of the period-luminosity relation and Gaia parallaxes. We used CHARA/MIRC to measure the astrome…
View article: First on-sky interference fringes at 810 nm with the CHARA array using servo controlled hectometric outdoor fibre links
First on-sky interference fringes at 810 nm with the CHARA array using servo controlled hectometric outdoor fibre links Open
In the framework of the ALOHA (Astronomical Light Optical Hybrid Analysis) project, we have implemented a fibre-linked interferometer connecting two telescopes of the CHARA (Center for High Angular Resolution Astronomy) array to the recomb…
View article: Sites of Planet Formation in Binary Systems. II. Double the Disks in DF Tau
Sites of Planet Formation in Binary Systems. II. Double the Disks in DF Tau Open
This article presents the latest results of our ALMA program to study circumstellar disk characteristics as a function of orbital and stellar properties in a sample of young binary star systems known to host at least one disk. Optical and …
View article: Visual Orbits of Wolf-Rayet Stars II: The Orbit of the Nitrogen-Rich WR Binary WR 138 measured with the CHARA Array
Visual Orbits of Wolf-Rayet Stars II: The Orbit of the Nitrogen-Rich WR Binary WR 138 measured with the CHARA Array Open
Classical Wolf-Rayet stars are descendants of massive OB-type stars that have lost their hydrogen-rich envelopes, and are in the final stages of stellar evolution, possibly exploding as type Ib/c supernovae. It is understood that the mecha…
View article: Visual Orbits of Wolf-Rayet Stars I: The Orbit of the dust-producing Wolf-Rayet binary WR\,137 measured with the CHARA Array
Visual Orbits of Wolf-Rayet Stars I: The Orbit of the dust-producing Wolf-Rayet binary WR\,137 measured with the CHARA Array Open
Classical Wolf-Rayet stars are the descendants of massive OB stars that have lost their hydrogen envelopes and are burning helium in their cores prior to exploding as type Ib/c supernovae. The mechanisms for losing their hydrogen envelopes…
View article: Open loop calibration and closed loop non-perturbative estimation of the lateral errors of an adaptive optics system: examples with GRAVITY+ and CHARA experimental data
Open loop calibration and closed loop non-perturbative estimation of the lateral errors of an adaptive optics system: examples with GRAVITY+ and CHARA experimental data Open
Performances of an adaptive optics (AO) system are directly linked with the quality of its alignment. During the instrument calibration, having open loop fast tools with a large capture range are necessary to quickly assess the system misa…
View article: CHARA Near-infrared Imaging of the Yellow Hypergiant Star ρ Cassiopeiae: Convection Cells and Circumstellar Envelope
CHARA Near-infrared Imaging of the Yellow Hypergiant Star ρ Cassiopeiae: Convection Cells and Circumstellar Envelope Open
Massive evolved stars such as red supergiants and hypergiants are potential progenitors of Type II supernovae, and they are known for ejecting substantial amounts of matter, up to half their initial mass, during their final evolutionary ph…
View article: Time Evolution Images of the Hypergiant RW Cephei during the Rebrightening Phase Following the Great Dimming
Time Evolution Images of the Hypergiant RW Cephei during the Rebrightening Phase Following the Great Dimming Open
Stars with initial masses larger than 8 M ⊙ undergo substantial mass loss through mechanisms that remain elusive. Unraveling the origins of this mass loss is important for comprehending the evolutionary path of these stars, the type of sup…
View article: The Orbit and Mass of the Cepheid AW Per <sup>∗</sup>
The Orbit and Mass of the Cepheid AW Per <sup>∗</sup> Open
The Cepheid AW Per is a component in a multiple system with a long-period orbit. The radial velocities of Griffin cover the 38 yr orbit well. An extensive program of interferometry with the Center for High Angular Resolution Astronomy arra…
View article: CHARA/Silmaril instrument software and data reduction pipeline: characterization of the instrument in the lab and on-sky
CHARA/Silmaril instrument software and data reduction pipeline: characterization of the instrument in the lab and on-sky Open
sponsorship: The construction of the Silmaril instrument was supported by USA National Science Foundation, under Grant No. NSF AST-1909858. This work is based upon observations obtained with the Georgia State University Center for High Ang…
View article: Open loop calibration and closed loop non-perturbative estimation of the lateral errors of an adaptive optics system: examples with GRAVITY+ and CHARA experimental data
Open loop calibration and closed loop non-perturbative estimation of the lateral errors of an adaptive optics system: examples with GRAVITY+ and CHARA experimental data Open
sponsorship: This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 10104719 This work made use of data acquired during CHARA and VLTI technical time.dy (European…
View article: Time-Evolution Images of the Hypergiant RW Cephei During the Re-brightening Phase Following the Great Dimming
Time-Evolution Images of the Hypergiant RW Cephei During the Re-brightening Phase Following the Great Dimming Open
Stars with initial masses larger than 8 solar masses undergo substantial mass loss through mechanisms that remain elusive. Unraveling the origins of this mass loss is important for comprehending the evolutionary path of these stars, the ty…
View article: Recent and Upcoming Upgrades for MIRC-X and MYSTIC on the CHARA Array
Recent and Upcoming Upgrades for MIRC-X and MYSTIC on the CHARA Array Open
MIRC-X and MYSTIC are six-telescope near-infrared beam (1.08-2.38 $μ$m) combiners at the CHARA Array on Mt Wilson CA, USA. Ever since the commissioning of MIRC-X (J and H bands) in 2018 and MYSTIC (K bands) in 2021, they have been the most…
View article: CHARA Near-Infrared Imaging of the Yellow Hypergiant Star $ρ$ Cassiopeiae: Convection Cells and Circumstellar Envelope
CHARA Near-Infrared Imaging of the Yellow Hypergiant Star $ρ$ Cassiopeiae: Convection Cells and Circumstellar Envelope Open
Massive evolved stars such as red supergiants and hypergiants are potential progenitors of Type II supernovae, and they are known for ejecting substantial amounts of matter, up to half their initial mass, during their final evolutionary ph…
View article: MoonLITE: a CLPS-delivered NASA Astrophysics Pioneers lunar optical interferometer for sensitive, milliarcsecond observing
MoonLITE: a CLPS-delivered NASA Astrophysics Pioneers lunar optical interferometer for sensitive, milliarcsecond observing Open
MoonLITE (Lunar InTerferometry Explorer) is an Astrophysics Pioneers proposal to develop, build, fly, and operate the first separated-aperture optical interferometer in space, delivering sub-mas science results. MoonLITE will leverage the …