ESO-Large Program on TNOs: Near-infrared spectroscopy with SINFONI

Guilbert, A.; Álvarez-Candal, A.; Merlin, F.; Barucci, Maria Antonietta; Dumas, Christophe; Bérgh, C. de; Delsanti, A.

doi:10.1016/j.icarus.2008.12.023

Cited by 76 publications

(98 citation statements)

References 49 publications

(23 reference statements)

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“…The very low thermal inertia is an indication that the surface might be covered by loose regolith with a low heat capacity in poor thermal contact. Although there are indications of crystalline water ice on the surface (Guilbert et al 2009), a solid compact layer of ice can be excluded, because this would require significantly higher thermal inertia. It was also possible, via the TPM, to investigate the influence of spin axis orientation, sense of rotation and rotation period, but for objects with very low thermal inertia the influence of the rotational properties are only on a level of less than 5% on the effective diameter 2 Orbit parameters as FK5/J2000.0 helio.…”

Section: Resultsmentioning

confidence: 99%

“TNOs are Cool”: A survey of the trans-Neptunian region

Mueller¹,

Lellouch

Stansberry

et al. 2010

A&A

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The goal of the Herschel open time key programme "TNOs are Cool!" is to derive the physical and thermal properties for a large sample of Centaurs and trans-Neptunian objects (TNOs), including resonant, classical, detached and scattered disk objects. We present results for seven targets either observed in PACS point-source, or in mini scan-map mode. Spitzer-MIPS observations were included for three objects. The sizes of these targets range from 100 km to almost 1000 km, five have low geometric albedos below 10%, (145480) 2005 TB 190 has a higher albedo above 15%. Classical thermal models driven by an intermediate beaming factor of η = 1.2 or η-values adjusted to the observed colour temperature fit the multi-band observations well in most cases. More sophisticated thermophysical models give very similar diameter and albedo values for thermal inertias in the range 0−25 J m −2 s −0.5 K −1 , consistent with very low heat conductivities at temperatures far away from the Sun. The early experience with observing and model strategies will allow us to derive physical and thermal properties for our complete Herschel TNO sample of 140 targets as a benchmark for understanding the solar system debris disk, and extra-solar ones as well.

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Section: Resultsmentioning

confidence: 99%

“TNOs are Cool”: A survey of the trans-Neptunian region

Mueller¹,

Lellouch

Stansberry

et al. 2010

A&A

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“…(1) Barucci et al (1999); (2) Alvarez-Candal et al (2008); (3) Guilbert et al (2009a); (4) Dotto et al (2003); (5) Brown & Koresko (1998); (6) .…”

Section: Analysis Of the Spectrumunclassified

“…The first spectrum that we modeled was that from Guilbert et al (2009a). which was acquired in 2007.…”

Section: Modeling Of the Surface Of Chariklomentioning

confidence: 99%

Photometric and spectroscopic evidence for a dense ring system around Centaur Chariklo

Duffárd

Pinilla-Alonso

Ortiz

et al. 2014

A&A

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Context. A stellar occultation observed on 3rd June 2013 revealed the presence of two dense and narrow rings separated by a small gap around the Centaur object (10 199) Chariklo. The composition of these rings is not known. We suspect that water ice is present in the rings, as is the case for Saturn and other rings around the giant planets. Aims. In this work, we aim to determine if the variability in the absolute magnitude of Chariklo and the temporal variation of the spectral ice feature, even when it disappeared in 2007, can be explained by an icy ring system whose aspect angle changes with time. Methods. We explained the variations on the absolute magnitude of Chariklo and its ring by modeling the light reflected by a system as the one described above. Using X-shooter at VLT, we obtained a new reflectance spectra. We compared this new set of data with the ones available in the literature. We showed how the water ice feature is visible in 2013 in accordance with the ring configuration, which had an opening angle of nearly 34 • in 2013. Finally, we also used models of light scattering to fit the visible and near-infrared spectra that shows different characteristics to obtain information on the composition of Chariklo and its rings. Results. We showed that absolute photometry of Chariklo from the literature and new photometric data that we obtained in 2013 can be explained by a ring of particles whose opening angle changes as a function of time. We used the two possible pole solutions for the ring system and found that only one of them, α = 151.30 ± 0.5, δ = 41.48 ± 0.2 • (λ = 137.9 ± 0.5, β = 27.7 ± 0.2 • ), provides the right variation of the aspect angle with time to explain the photometry, whereas the other possible pole solution fails to explain the photometry. From spectral modeling, we derived the composition of the Chariklo surface and that of the rings using the result on the pole solution. Chariklo surface is composed with about 60% of amorphous carbon, 30% of silicates and 10% of organics; no water ice was found on the surface. The ring, on the other hand, contains 20% of water ice, 40−70% of silicates, and 10−30% of tholins and small quantities of amorphous carbon.

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“…The H-and K-band spectroscopy (Guilbert et al 2009) was obtained using SINFONI, a near-infrared integral field spectrometer, installed on UT4-"Yepun" ESO-VLT. For these observations the H + K grating was used yielding a spectral resolution of about 1500 over the 1.45-2.45 μm range.…”

Section: Spectroscopymentioning

confidence: 99%

“…Barucci) we have obtained for this KBO visible and nearinfrared photometry (DeMeo et al 2009) and nearly simultaneous spectra in the visible (from 0.4 to 0.85 μm) and near-IR (J, H, and K bands). In this paper we have combined the visible (Alvarez-Cantal et al 2008) and SINFONI H + K spectrum (Guilbert et al 2009) with a J spectrum obtained the same night at ESO-VLT with the ISAAC instrument, as well as with broadband photometric data at 3.6 and 4.5 μm obtained at a different time with the Spitzer Space Telescope. Based on this extended set of data, we present a new interpretation of the surface composition of Quaoar.…”

Section: Introductionmentioning

confidence: 99%

Composition of KBO (50000) Quaoar

Ore

Barucci

Emery³

et al. 2009

A&A

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Aims. The objective of this work is to investigate the physical properties of objects beyond Neptune -the new frontiers of the Solar System -and in particular to study the surface composition of (50 000) Quaoar, a classical Transneptunian (or Kuiper Belt) object. Because of its distance from the Sun, Quaoar is expected to have preserved, to a degree, its original composition. Our goals are to determine to what degree this is true and to shed light on the chemical evolution of this icy body. Methods. We present new near-infrared (3.6 and 4.5 μm) photometric data obtained with the Spitzer Space Telescope. These data complement high resolution, low signal-to-noise spectroscopic and photometric data obtained in the visible and near-infrared (0.4-2.3 μm) at VLT-ESO and provide an excellent set of constraints in the model calculation process. We perform spectral modeling of the entire wavelength range -from 0.3 to 4.5 μm by means of a code based on the Shkuratov radiative transfer formulation of the slab model. We also attempt to determine the temperature of H 2 O ice making use of the crystalline feature at 1.65 μm.Results. We present a model confirming previous results regarding the presence of crystalline H 2 O and CH 4 ice, as well as C 2 H 6 and organic materials, on the surface of this distant icy body. We attempt a measurement of the temperature and find that stronger constraints on the composition are needed to obtain a precise determination. Conclusions. Model fits indicate that N 2 may be a significant component, along with a component that is bright at λ > 3.3 μm, which we suggest at this time could be amorphous H 2 O ice in tiny grains or thin grain coatings. Irradiated crystalline H 2 O could be the source of small-grained amorphous H 2 O ice. The albedo and composition of Quaoar, in particular the presence of N 2 , if confirmed, make this TNO quite similar to Triton and Pluto.

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ESO-Large Program on TNOs: Near-infrared spectroscopy with SINFONI

Cited by 76 publications

References 49 publications

“TNOs are Cool”: A survey of the trans-Neptunian region

“TNOs are Cool”: A survey of the trans-Neptunian region

Photometric and spectroscopic evidence for a dense ring system around Centaur Chariklo

Composition of KBO (50000) Quaoar

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