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Any measure of the radial mass distribution provides a first step in constraining the interior structure. The fluid Love number $k_2$ provides such a measure, and estimates of $k_2$ for extrasolar planets are expected to be available in the coming years thanks to improved observational facilities and the ever-extending temporal baseline of extrasolar planet observations.\n  Aims. We derive a method for calculating the Love numbers $k_n$ of any object given it"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1810.10064","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-10-23T19:35:04Z","cross_cats_sorted":[],"title_canon_sha256":"4cb3eb62b91c1da24eb5d2828fef463f479c7bd1c7cd2c41c118a55776eff25c","abstract_canon_sha256":"b34276b30f9b52580d43a6514178a57e740b0ceec0ea9664a62af4218ade2a9a"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:58:36.906887Z","signature_b64":"OzjMHXOhH9RX88IfE0OatKEF4PpYMKSUkLLKybiSv4wr1/RL1fw47kARbscVB/VLsrQGSdMoNrvsFgxrKW+lAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"db5c459795d99bc9d968662393a0766657a285aa9340d3ac984a2db0662cec5d","last_reissued_at":"2026-05-17T23:58:36.906151Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:58:36.906151Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Matrix-propagator approach to compute fluid Love numbers and applicability to extrasolar planets","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"D. Breuer, F. Sohl, H. Hellard, N. Tosi, P. Baumeister, S. Padovan, Sz. Csizmadia, T. Spohn","submitted_at":"2018-10-23T19:35:04Z","abstract_excerpt":"Context. The mass and radius of a planet directly provide its bulk density, which can be interpreted in terms of its overall composition. Any measure of the radial mass distribution provides a first step in constraining the interior structure. The fluid Love number $k_2$ provides such a measure, and estimates of $k_2$ for extrasolar planets are expected to be available in the coming years thanks to improved observational facilities and the ever-extending temporal baseline of extrasolar planet observations.\n  Aims. 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