Pith Number

pith:N77N2DM5

pith:2026:N77N2DM5EUGEPW7JWNJJWIMJQU

not attested not anchored not stored refs resolved

7DT Insight: Variability in Young Stellar Objects

Donggeun Tak, Donghwan Hyun, Gregory S. H. Paek, Hyeonho Choi, Hyeyoon Lee, Jeong-Eun Lee, Ji Hoon Kim, Jinho Lee, Mi-Ryang Kim, Myungshin Im, Seo-Won Chang, ShinGeon Kim, S. Thomas Megeath, Won-Hyeong Lee

Spot-like templates best match the wavelength dependence of day-scale variability for most young stellar objects in Orion A.

arxiv:2605.18366 v1 · 2026-05-18 · astro-ph.SR · astro-ph.GA

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\usepackage{pith}
\pithnumber{N77N2DM5EUGEPW7JWNJJWIMJQU}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

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

The best-fit results are dominated by spot-like templates (37 cold-spot and 22 hot-spot objects), with 37 sources best matched by extinction-like templates and 14 by the gray template.

C2weakest assumption

The five predefined templates (extinction with R_V = 3.1 and 5.5, gray, hot-spot, and cold-spot) are sufficient to capture the dominant physical mechanism producing the observed wavelength-dependent variability in the two-epoch data.

C3one line summary

Two-epoch medium-band photometry of 769 YSO candidates in Orion A identifies 110 variables (~14%), with best-fit templates dominated by cold and hot spot models over extinction or gray changes.

References

69 extracted · 69 resolved · 2 Pith anchors

[1] Akimoto, H., & Itoh, Y. 2019, International Journal of Astronomy and Astrophysics, 9, 321, doi: 10.4236/ijaa.2019.93023 Alcal´ a, J. M., Natta, A., Manara, C. F., et al. 2014, A&A, 561, A2, doi: 10.10 2019 · doi:10.4236/ijaa.2019.93023

[2] Alencar, S. H. P., Bouvier, J., Walter, F. M., et al. 2012, A&A, 541, A116, doi: 10.1051/0004-6361/201118395 2012 · doi:10.1051/0004-6361/201118395

[3] Armeni, A., Stelzer, B., Claes, R. A. B., et al. 2023, A&A, 679, A14, doi: 10.1051/0004-6361/202347051 2023 · doi:10.1051/0004-6361/202347051

[4] 2000, ApJS, 131, 465, doi: 10.1086/317378 2000 · doi:10.1086/317378

[5] M., & Herbst, W 1992 · doi:10.1086/186577

Formal links

1 machine-checked theorem link

Receipt and verification

First computed	2026-05-20T00:05:57.480957Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6ffedd0d9d250c47dbe9b3529b2189850379aa2f0aecc4e8f041ae9b58eb9c98

Aliases

arxiv: 2605.18366 · arxiv_version: 2605.18366v1 · doi: 10.48550/arxiv.2605.18366 · pith_short_12: N77N2DM5EUGE · pith_short_16: N77N2DM5EUGEPW7J · pith_short_8: N77N2DM5

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/N77N2DM5EUGEPW7JWNJJWIMJQU \
  | 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: 6ffedd0d9d250c47dbe9b3529b2189850379aa2f0aecc4e8f041ae9b58eb9c98

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3cbc12b06116805a5b15c729037a5728a0ca580ac986b6753c56b4e706123783",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2026-05-18T13:17:40Z",
    "title_canon_sha256": "8991eb0f3cb30fce28b2a90ac11e4c2367bd411fe49dbe0fc1ad4ca907e4486f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.18366",
    "kind": "arxiv",
    "version": 1
  }
}