Compositional study of asteroids in the Erigone collisional family using visible spectroscopy at the 10.4 m GTC

Morate, David; León, J. de; Prá, M. De; Licandro, J.; Cabrera-Lavers, A.; Campins, H.; Pinilla-Alonso, N.; Alí-Lagoa, V.

doi:10.1051/0004-6361/201527453

Cited by 36 publications

(53 citation statements)

References 46 publications

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“…In Fornasier et al (2014), the authors analyze a dataset of over 600 spectra of primitive asteroids in the literature and conclude that the aqueous alteration process is dominant in the 2.1 − 3.1 AU range, at smaller heliocentric distances than proposed by Vilas et al (1994). Morate et al (2016) and Morate et al (in prep. ) shows families in the inner belt with a high amount of hydrated objects.…”

Section: Discussionmentioning

confidence: 97%

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PRIMASS visits Hilda and Cybele groups

Pra

Pinilla-Alonso

Carvano

et al. 2018

Icarus

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The Cybele and Hilda dynamical groups delimit the outer edge of the asteroid belt. Their compositional distribution is a key element to constrain evolutionary models of the Solar System. In this paper, we present a compositional analysis of these populations using spectroscopic observations, SDSS and NEOWISE data. As part of the PRIMASS (Primitive Asteroids Spectroscopic Survey), we acquired visible spectra of 18 objects in Hilda or Cybele groups with the Goodman High Throughput Spectrometer at the 4.1m SOAR telescope and 20 near-IR spectra of Hilda objects with Near Infrared Camera Spectrograph at the 3.56m TNG. The sample is enlarged with spectra taken from the literature in order to increase our statistical analysis. The spectra were inspected for aqueous alteration bands and other spectral features that can be linked to compositional constraints. The analysis shows a continuous distribution of compositions from the main-belt to the Cybele, Hilda and Trojan regions. We also identify a population in the Trojans group not present in Hilda or Cybele objects.

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Section: Discussionmentioning

confidence: 97%

“…We search for the presence of this feature in our sample applying a methodology similar to the one in Carvano et al (2003) and Morate et al (2016). First we calculate the continuum with a linear fit within the 0.55-0.58 and 0.83-0.86 µm intervals.…”

Section: Visible Slopementioning

confidence: 99%

PRIMASS visits Hilda and Cybele groups

Pra

Pinilla-Alonso

Carvano

et al. 2018

Icarus

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“…The low-albedo X-complex asteroids could be compositionally similar to those of the C-complex (DeMeo et al 2009(DeMeo et al , 2015. An indication of the composition similarities and origin between the low-albedo asteroids belonging to the X-and C-complex also comes from the fact that C-and X-complex asteroids have been found within the same families (Morate et al 2016;Fornasier et al 2016). In the near-infrared survey of Popescu et al (2018) asteroids belonging to the Xcomplex are denoted by the class Xt.…”

Section: Characteristics Of the Spectroscopic X-complexmentioning

confidence: 99%

Ancient and primordial collisional families as the main sources of X-type asteroids of the inner main belt

Delbò

Avdellidou

Morbidelli

2019

A&A

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Aims. The near-Earth asteroid population suggests the existence of an inner Main Belt source of asteroids that belongs to the spectroscopic X-complex and has moderate albedos. The identification of such a source has been lacking so far. We argue that the most probable source is one or more collisional asteroid families that escaped discovery up to now. Methods. We apply a novel method to search for asteroid families in the inner Main Belt population of asteroids belonging to the Xcomplex with moderate albedo. Instead of searching for asteroid clusters in orbital elements space, which could be severely dispersed when older than some billions of years, our method looks for correlations between the orbital semimajor axis and the inverse size of asteroids. This correlation is the signature of members of collisional families, which drifted from a common centre under the effect of the Yarkovsky thermal effect. Results. We identify two previously unknown families in the inner Main Belt among the moderate-albedo X-complex asteroids. One of them, whose lowest numbered asteroid is (161) Athor, is ∼3 Gyrs-old, whereas the second one, whose lowest numbered object is (689) Zita, can be as old as the Solar System. Members of this latter family have orbital eccentricities and inclinations that spread them over the entire inner Main Belt, which is an indication that this family could be primordial, i.e. it formed before the giant planet orbital instability. Conclusions. The vast majority of moderate-albedo X-complex asteroids of the inner-Main Belt are genetically related, as they can be included into few asteroid families. Only nine X-complex asteroids with moderate albedo of the inner Main Belt cannot be included in asteroid families. We suggest that these bodies formed by direct accretion of the solids in the protoplanetary disk, and are thus surviving planetesimals.

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“…In contrast, Morate et al (2016) found that the distribution of taxonomic classes within the Erigone family ( Figure 5.3) differs significantly from that of Polana-Eulalia. Morate et al (2016) showed that the majority of the Erigone asteroids show a 0.7-µm hydration feature, while the Polana-Eulalias do not. These differences have implications for whether or not hydrated minerals may be present on the surfaces of Bennu, Ryugu, and 2008 EV5, all three of which could come from these two families.…”

Section: Inner Belt Primitive Asteroids: Families and Backgroundmentioning

confidence: 69%

“…FromMorate et al (2016). The different spectral types within the Erigone family, and the percentage of asteroids showing the 0.7-µm hydrated silicate absorption band (blue), for each primitive taxonomic class (green).…”

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confidence: 99%

Compositional Diversity Among Primitive Asteroids

Campins

León

Licandro

et al. 2018

Primitive Meteorites and Asteroids

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Spectroscopic observations from the ultraviolet to the mid-infrared have revealed new and diagnostic differences among primitive asteroids. We review the spectral characteristics of these asteroids and their inferred compositional and physical properties. Primitive asteroids throughout the belt show carbon-rich compounds, varying degrees of aqueous alteration and even surface ice; recent observations provide significant new constraints on composition, thermal inertia, and other surface properties. New mid-infrared connections between primitive asteroids and interplanetary dust particles indicate that the latter sample a larger fraction of main belt asteroids than meteorites. Links with the composition of comets are consistent with a proposed continuum between primitive asteroids and comets. Two sample-return missions, OSIRIS-REx and Hayabusa 2, will visit primitive near-Earth asteroids (NEAs). Most spacecraft-accessible NEAs originate in the inner asteroid belt, which contains several primitive asteroid families and a background of primitive asteroids outside these families. Initial results from these families offer a tantalizing preview of the properties expected in the NEAs they produce. So far, primitive asteroids in the inner belt fall into two spectral groups. The first group includes the Polana-Eulalia families, which show considerable spectral homogeneity in spite of their dynamical and collisional complexity. In contrast, the Erigone and Sulamitis families are spectrally diverse and most of their members show clear 0.7-µm hydration features. The two sample-return targets (101955) Bennu and (162173) Ryugu, most likely originated in the Polana family.

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Compositional study of asteroids in the Erigone collisional family using visible spectroscopy at the 10.4 m GTC

Cited by 36 publications

References 46 publications

PRIMASS visits Hilda and Cybele groups

PRIMASS visits Hilda and Cybele groups

Ancient and primordial collisional families as the main sources of X-type asteroids of the inner main belt

Compositional Diversity Among Primitive Asteroids

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