Pith Number

pith:CIZNZNW5

pith:2026:CIZNZNW55475DQDQO26J3XEUCQ

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JWST high-contrast spectroscopy with speckle modelling: Atmospheric retrievals of the T dwarf companion HD 19467 B

Dar\'io Gonz\'alez Picos, Ignas Snellen, Jean-Baptiste Ruffio, Natalie Grasser, Sam de Regt, Tessa van der Post

Jointly fitting speckle contamination with the atmospheric model enables native-resolution retrievals of HD 19467 B from JWST/NIRSpec without continuum subtraction.

arxiv:2605.02769 v1 · 2026-05-04 · astro-ph.EP · astro-ph.SR

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3 Author claim open · sign in to claim

4 Citations open

5 Replications open

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The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

Joint fitting of the atmospheric spectrum and the speckle contamination enables native-resolution retrievals of the high-contrast companion HD 19467 B with JWST/NIRSpec without continuum subtraction. Over 2.87--5.2 μm, medium-resolution spectroscopy constrains elemental and isotopic composition; both objects exhibit near-solar metallicity and subsolar C/O ratios.

C2weakest assumption

The assumption that a linear combination of integral-field-unit speckle spectra fully captures the wavelength-dependent residual stellar contamination without residual biases that propagate into the retrieved molecular abundances or isotopic ratios.

C3one line summary

Joint speckle-atmosphere retrievals on JWST spectra of HD 19467 B and a field T dwarf detect H2O, CH4, CO, CO2 and NH3, yield carbon isotopic ratios of 154 and 85 respectively, and show near-solar metallicity with subsolar C/O.

References

297 extracted · 297 resolved · 5 Pith anchors

[1] The Astrophysical Journal Supplement Series , keywords = · doi:10.3847/1538-4365/ac4414

[2] Abel, Martin and Frommhold, Lothar and Li, Xiaoping and Hunt, Katharine L. C. , doi =. Collision-. J. Phys. Chem. A , month =

[3] Accretion in Brown Dwarfs:

[4] doi:10.1086/321540 , eprint = · doi:10.1086/321540

[5] Zh and Sousa, S · doi:10.1051/0004-6361/201219401

Receipt and verification

First computed	2026-06-24T14:15:59.113826Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1232dcb6ddef3fd1c07076bc9ddc94141599b12664a3a5d1bba7e1704681a507

Aliases

arxiv: 2605.02769 · arxiv_version: 2605.02769v1 · doi: 10.48550/arxiv.2605.02769 · pith_short_12: CIZNZNW55475 · pith_short_16: CIZNZNW55475DQDQ · pith_short_8: CIZNZNW5

Agent API

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/CIZNZNW55475DQDQO26J3XEUCQ \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 1232dcb6ddef3fd1c07076bc9ddc94141599b12664a3a5d1bba7e1704681a507

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "eae231239e23e14d11ddb8cc641d3ca8e1719bee024d32318c31d607fc2bc1b5",
    "cross_cats_sorted": [
      "astro-ph.SR"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.EP",
    "submitted_at": "2026-05-04T16:09:12Z",
    "title_canon_sha256": "d601686794cc3c8558f2dfda739690f96bf7c8a1cda4732489fc82fec5fe654d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.02769",
    "kind": "arxiv",
    "version": 1
  }
}