ADONIS high contrast infrared imaging of Sirius-B

Bonnet‐Bidaud, J. M.; Pantin, E.

doi:10.1051/0004-6361:20078937

Cited by 8 publications

(14 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As an independent confirmation, we calibrate Sirius B's brightness using a brief observation of the A1V-type star HD 40138 as a reference. The result, 9.27 ± 0.17 mag, is consistent with our expected value of 9.17 ± 0.10 mag, which is based on the J-band photometry by Bonnet-Bidaud & Pantin (2008) and stellar spectra by Castelli & Kurucz (2003). This provides further evidence that Sirius B does not have an infrared excess from circumstellar dust as proposed by Bonnet-Bidaud & Pantin (2008).…”

Section: Subaru Ircs Br α Datasupporting

confidence: 91%

Piercing the Glare: A Direct Imaging Search for Planets in the Sirius System

Thalmann¹,

Usuda²,

Kenworthy³

et al. 2011

ApJ

View full text Add to dashboard Cite

Astrometric monitoring of the Sirius binary system over the past century has yielded several predictions for an unseen third system component, the most recent one suggesting a 50 M Jup object in a ∼6.3 year orbit around Sirius A. Here we present two epochs of high-contrast imaging observations performed with Subaru IRCS and AO188 in the 4.05 μm narrowband Br α filter. These data surpass previous observations by an order of magnitude in detectable companion mass, allowing us to probe the relevant separation range down to the planetary-mass regime (6-12 M Jup at 1 , 2-4 M Jup at 2 , and 1.6 M Jup beyond 4). We complement these data with one epoch of M-band observations from MMT/AO Clio, which reach comparable performance. No data set reveals any companion candidates above the 5σ level, allowing us to refute the existence of Sirius C as suggested by the previous astrometric analysis. Furthermore, our Br α photometry of Sirius B confirms the lack of an infrared excess beyond the white dwarf's blackbody spectrum.

show abstract

Section: Subaru Ircs Br α Datasupporting

confidence: 91%

Piercing the Glare: A Direct Imaging Search for Planets in the Sirius System

Thalmann¹,

Usuda²,

Kenworthy³

et al. 2011

ApJ

View full text Add to dashboard Cite

show abstract

“…Although Bonnet-Bidaud & Pantin (2008) reported a slight excess in the Ks-band, we find no evidence of a large mid-infrared excess, as would be expected for a DAZd white dwarf with a dusty debris disk (von Hippel et al 2007). 7 In comparing Sirius B to the DAZd class, we note that the DAZd white dwarfs described in the literature are mostly cooler (as described in Section 1) and do not have luminous binary companions.…”

Section: Discussioncontrasting

confidence: 45%

“…The solid curve is a blackbody with temperature=25,193K scaled to the STIS V-band flux, the dotted curve is the scaled infrared excess of the prototype DAZd white dwarf, G29-38, and the dashed curve is the scaled infrared excess of the hot white dwarf SDSS 1228+1040. Our Gemini/T-ReCS data show no evidence of a mid-infrared excess as hypothesized byBonnet-Bidaud & Pantin (2008).…”

supporting

confidence: 47%

Sirius B Imaged in the Mid-Infrared: No Evidence for a Remnant Planetary System

Skemer

2011

ApJ

View full text Add to dashboard Cite

Evidence is building that remnants of solar systems might orbit a large percentage of white dwarfs, as the polluted atmospheres of DAZ and DBZ white dwarfs indicate the very recent accretion of metal-rich material. (Zuckerman et al. 2010). Some of these polluted white dwarfs are found to have large mid-infrared excesses from close-in debris disks that are thought to be reservoirs for the metal accretion. These systems are coined DAZd white dwarfs Here we investigate the claims of Bonnet-Bidaud & Pantin (2008) that Sirius B, the nearest white dwarf to the Sun, might have an infrared excess from a dusty debris disk. Sirius B's companion, Sirius A is commonly observed as a mid-infrared photometric standard in the Southern hemisphere. We combine several years of Gemini/T-ReCS photometric standard observations to produce deep mid-infrared imaging in five ∼10µm filters (broad N + 4 narrowband), which reveal the presence of Sirius B. Our photometry is consistent with the expected photospheric emission such that we constrain any mid-infrared excess to 10% of the photosphere. Thus we conclude that Sirius B does not have a large dusty disk, as seen in DAZd white dwarfs.

show abstract

“…However, the extreme brightness of Sirius A has long been known to represent a major issue for such a search. Several attempts at detecting possible companions by imaging the close stellar field around Sirius from the ground using coronagraphic devices (Bonnet-Bidaud & Gry 1991;Bonnet-Bidaud et al 2000) and adaptive optics (ESO/ADONIS; Bonnet-Bidaud & Pantin 2008), or from space with the HST (Schroeder et al 2000), have proven unsuccessful. Deep imaging performed with ADONIS in K band reached a limiting contrast of 9.5 mag at 3 ′′ to 13.1 mag at 10 ′′ from Sirius A, this translates to the ability to detect massive brown dwarf companions.…”

Section: Introductionmentioning

confidence: 99%

High-contrast imaging of Sirius A with VLT/SPHERE: looking for giant planets down to one astronomical unit

Vigan

Gry

Salter

et al. 2015

Mon. Not. R. Astron. Soc.

108

View full text Add to dashboard Cite

Sirius has always attracted a lot of scientific interest, especially after the discovery of a companion white dwarf at the end of the 19 th century. Very early on, the existence of a potential third body was put forward to explain some of the observed properties of the system. We present new coronagraphic observations obtained with VLT/SPHERE that explore, for the very first time, the innermost regions of the system down to 0.2 ′′ (0.5 AU) from Sirius A. Our observations cover the near-infrared from 0.95 to 2.3 µm and they offer the best on-sky contrast ever reached at these angular separations. After detailing the steps of our SPHERE/IRDIFS data analysis, we present a robust method to derive detection limits for multi-spectral data from high-contrast imagers and spectrographs. In terms of raw performance, we report contrasts of 14.3 mag at 0.2 ′′ , ∼16.3 mag in the 0.4-1.0 ′′ range and down to 19 mag at 3.7 ′′ . In physical units, our observations are sensitive to giant planets down to 11 M Jup at 0.5 AU, 6-7 M Jup in the 1-2 AU range and ∼4 M Jup at 10 AU. Despite the exceptional sensitivity of our observations, we do not report the detection of additional companions around Sirius A. Using a Monte Carlo orbital analysis, we show that we can reject, with about 50% probability, the existence of an 8 M Jup planet orbiting at 1 AU.

show abstract

ADONIS high contrast infrared imaging of Sirius-B

Cited by 8 publications

References 18 publications

Piercing the Glare: A Direct Imaging Search for Planets in the Sirius System

Piercing the Glare: A Direct Imaging Search for Planets in the Sirius System

Sirius B Imaged in the Mid-Infrared: No Evidence for a Remnant Planetary System

High-contrast imaging of Sirius A with VLT/SPHERE: looking for giant planets down to one astronomical unit

Contact Info

Product

Resources

About