Both of Brazil's goals in the opening 45 minutes came in similar fashion - perfectly clipped crosses from the left by Debinha, met by the head of Ary.
The first header beat Panama keeper Yenith Bailey, while the second was kept out but tucked away by Ary on the rebound.
Ary unselfishly gave up a chance to seal a hat-trick, laying off for team-mate Zaneratto to finish a superb team move into the roof of the net - but she completed her treble after 70 minutes by heading through Bailey's legs.
Panama - one of eight first-time contenders in 2023 - were completely outclassed, rarely able to escape their own half.
Bright sparks Brazil impress in Adelaide
Like their male counterparts, Brazil have qualified for every edition of the Women's World Cup. Unlike the men, they have never won the competition.
Other than reaching the 2007 final, their history in the competition has been one of underachievement. In the last two editions, they have exited in the round of 16.
While signs here of a Brazil capable of going further must be taken with a pinch of salt, given the limited opponents, this comfortable and stylish win is a further indicator of a fresher, younger side which will be worth watching in what appears a very open field of competitors.
Hat-trick heroine Ary is one of 11 players in the squad featuring at their first World Cup, and the emotion of doing so told after she broke the Panamanian resistance on 19 minutes, covering her eyes and dropping to the turf in tears.
There is still room for the old guard. Marta, the competition's all-time record goalscorer, replaced Ary in the second half as the 37-year-old appears at her sixth World Cup.
Far tougher tasks lie ahead for Brazil - starting with France in a Saturday blockbuster - but the new Selecao have made a strong first statement.
Eight debutants, eight defeats
The same optimism and praise cannot be directed the way of Panama, the last of the debutants to make their bow.
Like the other seven, they lost without scoring; but even compared to the others, the central Americans looked very limited - constantly overrun down the flanks, easily dispossessed in the middle and toothless in attack.
They were indebted to goalkeeper Bailey for keeping the score down. She made a fine one-on-one save from Adriana after just 45 seconds and produced a fine one-handed save to keep out a curling Luana effort.
Panama face Jamaica next in a game they must win - and produce a radically improved performance - in order to have a chance of progression.
Line-ups
Brazil
Formation4-4-2
12Izidoro Lima da Silva
2da Costa Silva14Leal Costa4Leone Carvalho de Souza6Dias de Britto
17Alves Borges21Israel Ferraz5Bertolucci Paixão11Leal da Silva
16Zaneratto João9de Oliveira
12Izidoro Lima da Silva
2da Costa SilvaSubstituted forSantos Nhaiaat59'minutes
14Leal Costa
4Leone Carvalho de Souza
6Dias de Britto
17Alves BorgesSubstituted forVieira da Silva Veigaat75'minutes
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