Broadband linear polarization of Jupiter Trojans

Bagnulo, S.; Belskaya, I. N.; Stinson, A.; Christou, Apostolos; Borisov, G.

doi:10.1051/0004-6361/201526889

Cited by 10 publications

(10 citation statements)

References 36 publications

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“…If we analyze all the asteroid polarimetric data available today, including the data in the Asteroid Polarimetric Database (APD; Lupishko 2014) and that from papers not included in the APD (Cellino et al 2005;Masiero et al 2007;Rosenbush et al 2009;Masiero 2010;Cellino et al 2014;Zaitsev et al 2014;Gil-Hutton et al 2014;Bagnulo et al 2016;Belskaya et al 2017;Devogèle et al 2017;Gil-Hutton et al 2017, and the present paper), the total number of polarimetric measurements available in V-or R-band is 3028 for 515 asteroids, of which it is possible to obtain polarimetric parameters of good quality for 121 objects considering only measurements with σ < 0.25% 3 . The polarimetric parameters were obtained by fitting the observations to a phase-polarization curve using the function proposed by Kaasalainen et al (2003) and Muinonen et al (2009):…”

Section: Resultsmentioning

confidence: 99%

Polarimetric survey of main-belt asteroids

Gil-Hutton

García-Migani

2017

A&A

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The aims of this survey are to increase the database of asteroid polarimetry and to estimate the diversity in the polarimetric properties of asteroids that belong to different taxonomic classes. Methods. The data were obtained using the CASPOL polarimeter at the 2.15 m telescope. CASPOL is a polarimeter based on a CCD detector and a Savart plate. The survey began in 1995 and data on a large sample of asteroids were obtained until 2012. A second period began in 2013 using a polarimeter with a more sensitive detector in order to study small asteroids, families, and special taxonomic groups. Results. We present and analyze the unpublished results for 128 asteroids of different taxonomic types, 55 of them observed for the first time. The observational data allowed us to find probable new cases of Barbarian objects but also two D-type objects, (565) Marbachia and (1481) Tubingia, that seem to have phase-polarization curves with a large inversion angle. The data obtained combined with data from the literature enabled us to find phase-polarization curves for 121 objects of different taxonomic types and to study the relations between several polarimetric and physical parameters. Using an approximation for the phase-polarization curve we found the index of refraction of the surface material and the scatter separation distance for all the objects with known polarimetric parameters. We also found that the inversion angle is a function of the index of refraction of the surface, while the phase angle where the minimum of polarization is produced provides information about the distance between scatter particles or, to some extent, the porosity of the surface.

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Section: Resultsmentioning

confidence: 99%

Polarimetric survey of main-belt asteroids

Gil-Hutton

García-Migani

2017

A&A

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“…This indicates that the polarization property of 269 is closer to some icy objects than those of the Jovian Trojans with D-type spectral property. Cellino et al (2015), Cellino et al (2016), Belskaya et al (2010), Bagnulo et al (2016), andRosenbush et al (2015). The regions of F-type and Ch-or Cgh-type asteroids are shaded in lime green.…”

Section: Polarimetric Propertiesmentioning

confidence: 99%

“…Depth of negative polarization versus the phase angle of polarization minimum for dark objects in the Solar System. The polarimetric data of dark objects are cited from Gil-Hutton & García-Migani (2017), López-Sisterna et al (2019), Cellino et al (2015), Cellino et al (2016), Belskaya et al (2010),Bagnulo et al (2016), andRosenbush et al (2015). The regions of F-type and Ch-or Cgh-type asteroids are shaded in lime green.…”

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confidence: 99%

Discovery of two TNO-like bodies in the asteroid belt

Hasegawa,

Marsset,

DeMeo

et al. 2021

Preprint

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Two extremely red main-belt asteroids: 203 Pompeja and 269 Justitia, were identified from combined visible and near-infrared spectroscopic observations collected at the IRTF and SAO observatories. These two asteroids have a redder spectral slope than any other D-type body, which are the reddest objects in the asteroid belt, and similar to RR and IR-class objects found in the outer Solar System among trans-Neptunian objects and Centaurs. Spectroscopic results suggest the presence of complex organic materials on the surface layer of these asteroids, implying that they could have formed in the vicinity of Neptune and been transplanted to the main belt region during a phase of planetary migration. 203 Pompeia is the only very red asteroid known so far among the ∼250 bodies with diameter larger than 110 km (i.e. presumably structurally intact) found in the asteroid belt. These discoveries add another piece of evidence that the main asteroid belt hosts a population of bodies that were formed in the outskirt of the Solar System.

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“…For each observation, the exposure time accumulated over all exposures varied from 720 s (for 87168) to 2857 s (for 76378). Polarimetric data were then treated as explained in Bagnulo et al (2016), and, consequently, reduced Stokes parameters PQ = Q/I and PU = U/I were calculated adopting as a reference direction the perpendicular to the great circle passing through the object and the Sun. This way, PQ represents the flux perpendicular to the scattering plane minus the flux parallel to that plane, divided by the sum of these fluxes, and is therefore by definition identical to Pr).…”

Section: New Observationsmentioning

confidence: 99%

“…It is important to note also that the errors on the polarimetric measurements were calculated based only on photon noise using normal error propagation of the flux errors (see, e.g., Bagnulo et al 2009). Systematics with FORS2 are of the order of a few units in 10 −4 (e.g., Bagnulo et al 2016). It is also useful to point out that FORS acquired polarimetric standard stars within its calibration plan, and the fact that PU is always consistent with zero, means that the polarimetric optics were consistently well aligned.…”

Section: Datementioning

confidence: 99%

Brangäne: a new family of Barbarian asteroids

Cellino

Bagnulo

Tanga

et al. 2019

Monthly Notices of the Royal Astronomical Society

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The so-called Barbarian asteroids (from the name of the prototype of this class, asteroid (234) Barbara) are extremely interesting objects because they might be the survivors of a very early generation of planetesimals. We have identified in the past the first case of an asteroid family (the Watsonia family) whose members are Barbarians, all issued from the collisional disruption of a sizeable parent body. Here we report on the identification of another family, called after the name of its biggest member, asteroid (606) Brangäne, consisting of objects displaying the polarimetric properties characterizing the Barbarian behaviour. This is the first recognized case of a swarm of small Barbarians issued from a quite recent cratering event.

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Broadband linear polarization of Jupiter Trojans

Cited by 10 publications

References 36 publications

Polarimetric survey of main-belt asteroids

Polarimetric survey of main-belt asteroids

Discovery of two TNO-like bodies in the asteroid belt

Brangäne: a new family of Barbarian asteroids

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