SPHERE IFS: the spectro differential imager of the VLT for exoplanets search

Claudi, R.; Turatto, M.; Giro, E.; Mesa, D.; Anselmi, U.; Bruno, P.; Cascone, E.; Caprio, Vincenzo De; Desidera, S.; Dorn, Reinhold J.; Fantinel, D.; Finger, Glenn; Gratton, R.; Lessio, L.; Lizon, Jean-Louis; Salasnic, B.; Scuderi, S.; Døhlen, K.; Beuzit, Jean-Luc; Puget, P.; Antichi, J.; Hubin, N.; Kasper, Markus

doi:10.1117/12.788366

Cited by 111 publications

(30 citation statements)

References 8 publications

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“…To test the idea of TYC 7218 being a triple system, we observed it with the high contrast imager SPHERE (Beuzit et al 2019) in the IRDIFS mode. Acquisition of direct imaging was made with IRDIS (Dohlen et al 2008) in the dual band imaging mode (Vigan et al 2010) using the H2-H3 bands with simultaneous spectro-imaging using IFS (Claudi et al 2008) in the Y and J spectral bands. The aim of these observations was to confirm the triple nature of the system and to characterise the third object, i.e.…”

Section: The Triple Nature Of Tyc 7218 Confirmed With Spherementioning

confidence: 99%

The White Dwarf Binary Pathways Survey −III. Contamination from hierarchical triples containing a white dwarf

Lagos

Schreiber

Parsons

et al. 2020

Monthly Notices of the Royal Astronomical Society

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The White Dwarf Binary Pathways Survey aims at increasing the number of known detached A, F, G and K main sequence stars in close orbits with white dwarf companions (WD+AFGK binaries) to refine our understanding about compact binary evolution and the nature of Supernova Ia progenitors. These close WD+AFGK binary stars are expected to form through common envelope evolution, in which tidal forces tend to circularize the orbit. However, some of the identified WD+AFGK binary candidates show eccentric orbits, indicating that these systems are either formed through a different mechanism or perhaps they are not close WD+AFGK binaries. We observed one of these eccentric WD+AFGK binaries with SPHERE and find that the system TYC 7218-934-1 is in fact a triple system where the WD is a distant companion. The inner binary likely consists of the G-type star plus an unseen low mass companion in an eccentric orbit. Based on this finding, we estimate the fraction of triple systems that could contaminate the WD+AFGK sample. We find that less than 15 per cent of our targets with orbital periods shorter than 100 days might be hierarchical triples.

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Section: The Triple Nature Of Tyc 7218 Confirmed With Spherementioning

confidence: 99%

The White Dwarf Binary Pathways Survey −III. Contamination from hierarchical triples containing a white dwarf

Lagos

Schreiber

Parsons

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…HD 163296 was observed during the nights of 2017-09-29 and 2018-05-06 with SPHERE operating in the IRDIFS EXT mode. In this mode, IRDIS (infrared dual-band imager and spectrograph; Dohlen et al 2008) operates in dual-band imaging (Vigan et al 2010) configuration with the K1-K2 filters (K1=2.110 µm; K2=2.251 µm) while IFS (integral field spectrograph; Claudi et al 2008) works in the Y-H spectral bands between 0.95 and 1.65 µm. In the first epoch the total exposure time was of 1536 s with IRDIS and of 1728 s with IFS while in the second epoch it was of 4608 s with both instruments.…”

Section: Observations and Data Reductionmentioning

confidence: 99%

Determining mass limits around HD 163296 through SPHERE direct imaging data

Mesa

Langlois

Garufi

et al. 2019

Monthly Notices of the Royal Astronomical Society

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HD 163296 is a Herbig Ae/Be star known to host a protoplanetary disk with a ringed structure. To explain the disk features, previous works proposed the presence of planets embedded into the disk. We have observed HD 163296 with the near-infrared (NIR) branch of SPHERE composed by IRDIS and IFS with the aim to put tight constraints on the presence of substellar companions around this star. Despite the low rotation of the field of view during our observation we were able to put upper mass limits of few M Jup around this object. These limits do not allow to give any definitive conclusion about the planets proposed through the disk characteristics. On the other hand, our results seem to exclude the presence of the only candidate proposed until now using direct imaging in the NIR even if some caution has to be taken considered the different wavelength bands of the two observations.

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“…Additionally, we collected publicly available SPHERE (Beuzit et al 2019) observations of HD 37306 from the ESO archive (program ID 095.C-0212). The observations were performed using the dual-band imaging mode IRDIFS (H2H3, Vigan et al 2010, Dohlen et al 2008, Claudi et al 2008. Basic data reduction was performed using the SPHERE Data Reduction Handling pipeline (Pavlov et al 2008), to perform background subtraction, flat-field and bad pixels corrections, and to determine the position of the star behind the coronograph.…”

Section: Imaging Datamentioning

confidence: 99%

An unusually large gaseous transit in a debris disc

Iglesias

Olofsson

Bayo

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We present the detection of an unusually large transient gas absorption in several ionized species in the debris disc star HD 37306 using high-resolution optical spectra. We have been analysing a large sample of debris discs searching for circumstellar gas absorptions aiming to determine the frequency of gas in debris discs. HD 37306 stood out showing remarkably broad absorptions superimposed onto several photospheric Ca ii, Fe ii and Ti ii lines. The observed absorptions, unlike typical exocometary transits, lasted for at least eight days. Here we analyse simultaneous spectroscopic and photometric data of the event and evaluate different scenarios that might explain the observed features. We conclude that the most likely scenario might be an exocometary break-up releasing a significant amount of gas close to the star, producing an occulting "ring"/"torus" shape.

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SPHERE IFS: the spectro differential imager of the VLT for exoplanets search

Cited by 111 publications

References 8 publications

The White Dwarf Binary Pathways Survey −III. Contamination from hierarchical triples containing a white dwarf

The White Dwarf Binary Pathways Survey −III. Contamination from hierarchical triples containing a white dwarf

Determining mass limits around HD 163296 through SPHERE direct imaging data

An unusually large gaseous transit in a debris disc

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