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Diving into the magnetosphere of the Of?p star HD108
Gregor Rauw, Yaël Nazé, Asif ud-Doula +1
We analyse optical and X-ray spectroscopy of the Of?p star HD108, known for its strong dipolar magnetic field and its optical line profile variability with a timescale of $54 \pm 3…
Ultraviolet Spectropolarimetry With Polstar: Using Polstar to test Magnetospheric Mass-loss Quenching
M. E. Shultz, R. Casini, M. C. M. Cheung +17
Polstar is a proposed NASA MIDEX space telescope that will provide high-resolution, simultaneous full-Stokes spectropolarimetry in the far ultraviolet, together with low-resolution…
The magnetic field of the chemically peculiar star V352Peg
L. Fréour, C. Neiner, J. D. Landstreet +2
We present a spectropolarimetric analysis of the hot star V352Peg. We have acquired 18 spectropolarimetric observations of the star with ESPaDOnS at the CFHT between 2018 and 2019…
Ultraviolet Spectropolarimetry: Investigating stellar magnetic field diagnostics
C. P. Folsom, R. Ignace, C. Erba +9
Magnetic fields are important for stellar photospheres and magnetospheres, influencing photospheric physics and sculpting stellar winds. Observations of stellar magnetic fields are…
Ultraviolet Spectropolarimetric Diagnostics of Hot Star Magnetospheres
Asif ud-Doula, M. C. M. Cheung, A. David-Uraz +11
Several space missions and instruments for UV spectropolarimetry are in preparation, such as the proposed NASA MIDEX Polstar project, the proposed ESA M mission Arago, and the Poll…
MOBSTER -- VI. The crucial influence of rotation on the radio magnetospheres of hot stars
M. E. Shultz, S. P. Owocki, A. ud-Doula +13
Numerous magnetic hot stars exhibit gyrosynchrotron radio emission. The source electrons were previously thought to be accelerated to relativistic velocities in the current sheet f…
Magnetic field topology, chemical spot distributions and photometric variability of the Ap star phi Draconis
O. Kochukhov, N. Papakonstantinou, C. Neiner
The primary component of the multiple star phi Dra is one of the brightest magnetic chemically peculiar stars in the northern sky. Here we report results of a comprehensive study o…
The magnetic field and magnetosphere of Plaskett's star: A fundamental shift in our understanding of the system
J. H. Grunhut, G. A. Wade, C. P. Folsom +7
Plaskett's "star" appears to be one of a small number of short-period binary systems known to contain a hot, massive, magnetic star. Building on the 2013 discovery investigation, w…
Discovery of eight 'Main-sequence Radio Pulse emitters' using the GMRT: clues to the onset of coherent radio emission in hot magnetic stars
Barnali Das, Poonam Chandra, Matt E. Shultz +6
'Main-sequence radio pulse-emitters' (MRPs) are magnetic early-type stars from which periodic radio pulses, produced via electron cyclotron maser emission (ECME), are observed. Des…
TESS survey of rotational and pulsational variability of mercury-manganese stars
O. Kochukhov, V. Khalack, O. Kobzar +4
Mercury-manganese (HgMn) stars are late-B upper main sequence chemically peculiar stars distinguished by large overabundances of heavy elements, slow rotation, and frequent members…
Space Photometry with BRITE-Constellation
Weiss W. W, Zwintz K., Kuschnig R. +16
BRITE-Constellation is devoted to high-precision optical photometric monitoring of bright stars, distributed all over the Milky Way, in red and/or blue passbands. Photometry from s…
Dispersal timescale of protoplanetary disks in the low-metallicity young cluster Dolidze 25
M. G. Guarcello, K. Biazzo, J. J. Drake +7
The dispersal of protoplanetary disks sets the timescale available for planets to assemble, and thus it is one of the fundamental parameters in theories of planetary formation. Dis…
Magnetic signatures on mixed-mode frequencies. I. An axisymmetric fossil field inside the core of red giants
L. Bugnet, V. Prat, S. Mathis +6
The discovery of the moderate differential rotation between the core and the envelope of evolved solar-like stars could be the signature of a strong magnetic field trapped inside t…
The impact of a fossil magnetic field on dipolar mixed-mode frequencies in sub- and red-giant stars
L. Bugnet, V. Prat, S. Mathis +5
Stars more massive than M are known to develop a convective core during the main-sequence: the dynamo process triggered by this convection could be the origin of…
The complex fossil magnetic field of the Scuti star HD\,41641
Keegan Thomson-Paressant, Coralie Neiner, Konstanze Zwintz +1
Only three magnetic Scuti stars are known as of today. HD 41641 is a Scuti star showing chemical peculiarities and rotational modulation of its light-curve, making it a goo…
The Magnetic Early B-type Stars IV: Breakout or Leakage? H emission as a diagnostic of plasma transport in centrifugal magnetospheres
M. E. Shultz, S. Owocki, Th. Rivinius +15
Rapidly rotating early-type stars with strong magnetic fields frequently show H emission originating in Centrifugal Magnetospheres (CMs), circumstellar structures in which centr…
beta Cas: the first delta Scuti star with a dynamo magnetic field
K. Zwintz, C. Neiner, O. Kochukhov +10
F type stars are characterised by several physical processes such as different pulsation mechanisms, rotation, convection, diffusion, and magnetic fields. The rapidly rotating delt…
Spectroscopic Detection of the Pre-White Dwarf Companion of Regulus
Douglas R. Gies, Kathryn V. Lester, Luqian Wang +6
Mass transfer in an interacting binary will often strip the mass donor of its entire envelope and spin up the mass gainer to near critical rotation. The nearby B-type star Regulus…
Period spacings of gravity modes in rapidly rotating magnetic stars II. The case of an oblique dipolar fossil magnetic field
Vincent Prat, Stéphane Mathis, Coralie Neiner +3
Context. Stellar internal magnetic fields have recently been shown to leave a detectable signature on period spacing patterns of gravity modes. Aims. We investigate the effect of t…
A search for strong magnetic fields in massive and very massive stars in the Magellanic Clouds
S. Bagnulo, G. A. Wade, Y. Naze +13
Despite their rarity, massive stars dominate the ecology of galaxies via their strong, radiatively-driven winds throughout their lives and as supernovae in their deaths. However, t…
Magnetic geometry and surface differential rotation of the bright Am star Alhena A
Aurore Blazère, Pascal Petit, Coralie Neiner +5
Alhena A ( Gem A) is a bright Am star, with the strongest disc-integrated magnetic field strength reported so far for an Am star. Its spectrum exhibits standard circularly polar…
MOBSTER: Establishing a Picture of Magnetic Massive Stars as a Population
Alexandre David-Uraz, Coralie Neiner, James Sikora +12
Magnetic massive and intermediate-mass stars constitute a separate population whose properties are still not fully understood. Increasing the sample of known objects of this type w…
Magnetic OB[A] Stars with TESS: probing their Evolutionary and Rotational properties -- The MOBSTER Collaboration
A. David-Uraz, C. Neiner, J. Sikora +14
In this contribution, we present the MOBSTER Collaboration, a large community effort to leverage high-precision photometry from the Transiting Exoplanet Survey Satellite (\textit{T…
PolStar -- An Explorer-Class FUV Spectropolarimetry Mission to Map the Environments of Massive Stars
Paul Scowen, Richard Ignace, Coralie Neiner +26
PolStar is an Explorer-class far ultraviolet (FUV) spectropolarimetry mission designed to target massive stars and their environments. PolStar will take advantage of resonance line…