Optical linear polarization of helium-rich white dwarfs samplewith the RoboPol polarimeter

Słowikowska, A.; Krzeszowski, K.; Żejmo, M.; Blinov, D.; Reig, P.

doi:10.1093/mnras/sty1745

Cited by 4 publications

(3 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…West 1989). When linear polarization is seen in blind surveys of white dwarfs, it is attributed to magnetism ( Żejmo et al 2016;Słowikowska et al 2018). However, G29-38 has a magnetic field less than ∼100 G (Liebert, Saffer & Pilachowski 1989), so it is assumed that a measured polarization will be due to its dust.…”

mentioning

confidence: 99%

Polarization measurements of the polluted white dwarf G29-38

Cotton

Bailey

Pringle

et al. 2020

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We have made high-precision polarimetric observations of the polluted white dwarf G29-38 with the HIgh Precision Polarimetric Instrument 2. The observations were made at two different observatories – using the 8.1-m Gemini North Telescope and the 3.9-m Anglo-Australian Telescope – and are consistent with each other. After allowing for a small amount of interstellar polarization, the intrinsic linear polarization of the system is found to be 275.3 ± 31.9 parts per million at a position angle of 90.8 ± 3.8° in the SDSS g′ band. We compare the observed polarization with the predictions of circumstellar disc models. The measured polarization is small in the context of the models we develop, which only allows us to place limits on disc inclination and Bond albedo for optically thin disc geometries. In this case, either the inclination is near-face-on or the albedo is small – likely in the range 0.05–0.15 – which is in line with other debris disc measurements. A preliminary search for the effects of G29-38’s pulsations in the polarization signal produced inconsistent results. This may be caused by beating effects, indicate a clumpy dust distribution, or be a consequence of measurement systematics.

show abstract

mentioning

confidence: 99%

Polarization measurements of the polluted white dwarf G29-38

Cotton

Bailey

Pringle

et al. 2020

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

“…For non-variable magnetic white dwarfs it is assumed that they are either rotating with a very long period or that their magnetic fields are nearly aligned with the rotation axis. A recent statistical analysis of the linear polarization properties between magnetic and non-magnetic white dwarfs showed no difference in the polarization degrees ( Żejmo et al 2017;Słowikowska et al 2018). Such an analysis allowed the authors to select a set of good candidates of faint linear polarimetric standard stars that can be used as stable polarimetric calibration sources.…”

Section: Degenerate Stellar Remnantsmentioning

confidence: 99%

Spectropolarimetry of Stars Across the H-R Diagram

Hubrig

Schöller²

2019

Astrophysics and Space Science Library

View full text Add to dashboard Cite

The growing sample of magnetic stars shows a remarkable diversity in the properties of their magnetic fields. The overall goal of current studies is to understand the origin, evolution, and structure of stellar magnetic fields in stars of different mass at different evolutionary stages. In this chapter we discuss recent measurements together with the underlying assumptions in the interpretation of data and the requirements, both observational and theoretical, for obtaining a realistic overview of the role of magnetic fields in various types of stars.

show abstract

“…Operating successfully since 2013, data collected by RoboPol have contributed in multiple publications in the field of blazars (Pavlidou et al 2014;Blinov et al 2015Blinov et al , 2016aHovatta et al 2016;Angelakis et al 2016;Liodakis et al 2017;Raiteri et al 2017;Kiehlmann et al 2017;Uemura et al 2017;Blinov et al 2018), galactic binaries and white dwarfs (Reig et al 2014;Żejmo et al 2017;Reig et al 2017;S lowikowska et al 2018), gamma-ray bursts (King et al 2014b), and the interstellar medium (Panopoulou et al 2015(Panopoulou et al , 2016Skalidis et al 2018).…”

Section: Introductionmentioning

confidence: 99%

RoboPol: a four-channel optical imaging polarimeter

Ramaprakash

Rajarshi

Das

et al. 2019

Monthly Notices of the Royal Astronomical Society

Self Cite

View full text Add to dashboard Cite

We present the design and performance of RoboPol, a four-channel optical polarimeter operating at the Skinakas Observatory in Crete, Greece. RoboPol is capable of measuring both relative linear Stokes parameters q and u (and the total intensity I) in one sky exposure. Though primarily used to measure the polarization of point sources in the R-band, the instrument features additional filters (B, V and I), enabling multi-wavelength imaging polarimetry over a large field of view (13.6 ′ × 13.6 ′ ). We demonstrate the accuracy and stability of the instrument throughout its five years of operation. Best performance is achieved within the central region of the field of view and in the R band. For such measurements the systematic uncertainty is below 0.1% in fractional linear polarization, p (0.05% maximum likelihood). Throughout all observing seasons the instrumental polarization varies within 0.1% in p and within ∼1 • in polarization angle.

show abstract

Optical linear polarization of helium-rich white dwarfs samplewith the RoboPol polarimeter

Cited by 4 publications

References 49 publications

Polarization measurements of the polluted white dwarf G29-38

Polarization measurements of the polluted white dwarf G29-38

Spectropolarimetry of Stars Across the H-R Diagram

RoboPol: a four-channel optical imaging polarimeter

Contact Info

Product

Resources

About