Component-resolved Near-infrared Spectra of the (22) Kalliope System

TL;DR

This study presents the first component-resolved near-infrared spectra of the (22) Kalliope system, revealing similar compositions of the primary and its companion, suggesting a common origin from re-accretion after a major impact.

Contribution

First simultaneous component-resolved near-infrared spectra of (22) Kalliope and Linus, showing their similar composition and implying a shared formation history.

Findings

Spectra of Kalliope and Linus are remarkably similar.

Both bodies likely formed from the same material.

Implication of formation via re-accretion after impact.

Abstract

We observed (22) Kalliope and its companion Linus with the integral-field spectrograph OSIRIS, which is coupled to the adaptive optics system at the W.M. Keck II telescope on March 25 2008. We present, for the first time, component-resolved spectra acquired simultaneously in each of the Zbb (1-1.18 um), Jbb (1.18-1.42 um), Hbb (1.47-1.80 um), and Kbb (1.97-2.38 um) bands. The spectra of the two bodies are remarkably similar and imply that both bodies were formed at the same time from the same material; such as via incomplete re-accretion after a major impact on the precursor body.